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 A045562 Numbers whose factorial has '56' as its final two digits before the trailing zeros. 1
 61, 96, 130, 139, 159, 161, 166, 178, 187, 192, 211, 218, 236, 255, 264, 324, 334, 341, 361, 388, 406, 432, 446, 458, 469, 483, 489, 494, 507, 537, 549, 555, 575, 576, 587, 624, 637, 654, 657, 684, 691, 697, 746, 756, 788, 793, 797, 824, 838, 840 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 MATHEMATICA lnzQ[n_]:=Module[{idn=IntegerDigits[n!], lz}, lz=Length[Last[Split[idn]]]; Take[idn, {-2-lz, -1-lz}]=={5, 6}]; Select[Range[10, 850], lnzQ] (* Harvey P. Dale, Mar 05 2013 *) PROG (PARI) last(n, k)=if(n*8\9-1

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Last modified March 24 12:09 EDT 2023. Contains 361479 sequences. (Running on oeis4.)