Ban number Further reading External links Navigation menu"Aban Number""Eban number""Iban number""Oban Number""Uban number"e

AchillesPower of 2Power of 10SquareCubeFourth powerFifth powerSixth powerSeventh powerPerfect powerPowerfulPrime powerCarolHilbertIdonealKyneaLeylandLoeschianLucky numbers of EulerRepunitKnödelRieselSierpinskiLuckyCentered triangularCentered squareCentered pentagonalCentered hexagonalCentered heptagonalCentered octagonalCentered nonagonalCentered decagonalStarTriangularSquarePronicSquare triangularPentagonalHexagonalHeptagonalOctagonalNonagonalDecagonalDodecagonalCentered tetrahedralCentered cubeCentered octahedralCentered dodecahedralCentered icosahedralTetrahedralOctahedralDodecahedralIcosahedralStella octangulaSquare pyramidalPentagonal pyramidalHexagonal pyramidalHeptagonal pyramidalCentered pentachoricSquared triangularPentatopeBellCakeCatalanDedekindDelannoyEulerFuss–CatalanLazy caterer's sequenceLobbMotzkinNarayanaOrdered BellSchröderSchröder–HipparchusAlmost perfectArithmeticColossally abundantDescartesHemiperfectHighly abundantHighly compositeHyperperfectMultiply perfectPerfectPractical numberPrimitive abundantQuasiperfectRefactorableSublimeSuperabundantSuperior highly compositeSuperperfectAlmost primeCompositePrimeSemiprimeHighly cototientHighly totientNoncototientNontotientPerfect totientSparsely totientAbundantAmicableBetrothedDeficientSemiperfectSociableUntouchableWeirdEuclidFortunateBlumErdős–NicolasErdős–WoodsFriendlyGiugaHarmonic divisorRegularRoughSmoothSphenicStørmerSuper-PouletZeiselAutomorphicCyclicDigit-reassemblyDudeneyEquidigitalExtravagantFactorionFriedmanFrugalHappyHarshadKaprekarKeithLychrelMissing-digit sumNarcissisticPalindromicPandigitalParasiticPerniciousPolydivisiblePrimevalRepdigitRepunitSelfSelf-descriptiveSmarandache–WellinSmithStrictly non-palindromicStrobogrammaticSum-productTransposableTrimorphicUndulatingVampireAronson's sequenceBanPancake number


Integer sequences


recreational mathematicslarge numbersgoogolgoogolplex




In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned." Ban numbers are not precisely defined, since some large numbers do not follow the standards of number names (such as googol and googolplex).


There are several published sequences of ban numbers:


  • The aban numbers do not contain the letter A. The first few aban numbers are 1 through 999, 1,000,000 through 1,000,999, 2,000,000 through 2,000,999, ... The word "and" is not counted.

  • The eban numbers do not contain the letter E. The first few eban numbers are 2, 4, 6, 30, 32, 34, 36, 40, 42, 44, 46, 50, 52, 54, 56, 60, 62, 64, 66, 2000, 2002, 2004, ... (sequence A006933 in the OEIS). The sequence was coined in 1990 by Neil Sloane. Coincidentally, all the numbers in the sequence are even.

  • The iban numbers do not contain the letter I. The first few iban numbers are 1, 2, 3, 4, 7, 10, 11, 12, 14, 17, 20, 21, 22, 23, 24, 27, 40, ... (sequence A089589 in the OEIS). Since all -illion numbers contain the letter I, there are exactly 30,275 iban numbers, the largest being 777,777.

  • The oban numbers do not contain the letter O. The first few oban numbers are 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 23, 25, 26, ... (sequence A008521 in the OEIS). Since "thousand" and all the -illion numbers contain the letter O, there are exactly 454 oban numbers, the largest being 999.

  • The tban numbers do not contain the letter T. The first few tban numbers are 1, 4, 5, 6, 7, 9, 11, 100, 101, 104, 105, 106, 107, 109, 111, 400, 401, 404, 405, 406, ... (sequence A008523 in the OEIS).

  • The uban numbers do not contain the letter U. The first few uban numbers are 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, ... (sequence A089590 in the OEIS).


Further reading



  • Hernandez, J. C.; Mex-Perera, C.; Shepherd, S. J. (2002–2003). Characterization of Eban Numbers (31 ed.). J. Recr. Math. p. 197–200..mw-parser-output cite.citationfont-style:inherit.mw-parser-output .citation qquotes:"""""""'""'".mw-parser-output .citation .cs1-lock-free abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .citation .cs1-lock-subscription abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registrationcolor:#555.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration spanborder-bottom:1px dotted;cursor:help.mw-parser-output .cs1-ws-icon abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center.mw-parser-output code.cs1-codecolor:inherit;background:inherit;border:inherit;padding:inherit.mw-parser-output .cs1-hidden-errordisplay:none;font-size:100%.mw-parser-output .cs1-visible-errorfont-size:100%.mw-parser-output .cs1-maintdisplay:none;color:#33aa33;margin-left:0.3em.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-formatfont-size:95%.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-leftpadding-left:0.2em.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-rightpadding-right:0.2em


External links


  • Weisstein, Eric W. "Aban Number". MathWorld.

  • Weisstein, Eric W. "Eban number". MathWorld.

  • Weisstein, Eric W. "Iban number". MathWorld.

  • Weisstein, Eric W. "Oban Number". MathWorld.

  • Weisstein, Eric W. "Uban number". MathWorld.







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