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 A178223 Numbers n such that the digits of n are also digits of n! (counting multiplicity). 0
 1, 2, 4, 20, 21, 22, 23, 24, 25, 26, 27, 30, 31, 32, 33, 34, 35, 36, 37, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE 23 is in the sequence because 2 and 3 are digits of 23! = 25852016738884976640000 ; 28 is not in the sequence because 2 is not a digit of 28! = 304888344611713860501504000000. 11 is not in the sequence because 11! = 39916800 contains only a single "1". MATHEMATICA Reap[Do[a = DigitCount[n!]; b = DigitCount[n]; If[Min[a-b] >= 0, Sow[n]], {n, 1, 10^3}]][[2, 1]] CROSSREFS Cf. A064827 Sequence in context: A316389 A133521 A122158 * A033180 A215815 A295826 Adjacent sequences: A178220 A178221 A178222 * A178224 A178225 A178226 KEYWORD nonn,base AUTHOR Michel Lagneau, Dec 20 2010 STATUS approved

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Last modified March 30 04:12 EDT 2023. Contains 361603 sequences. (Running on oeis4.)