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A045558 Numbers n such that final 2 nonzero digits of n! are '36'. 1
24, 63, 82, 95, 98, 104, 131, 163, 168, 172, 199, 213, 215, 234, 238, 241, 256, 284, 286, 291, 336, 343, 359, 363, 366, 408, 419, 445, 448, 504, 556, 564, 578, 617, 642, 671, 685, 693, 745, 748, 758, 769, 790 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Index entries for sequences related to final digits of numbers

PROG

(PARI) last(n, k)=if(n*8\9-1<k, n=n!; return(n/10^valuation(n, 10)%10^k)); my(m=Mod(1, 5^k)); for(i=2, n, m*=i/10^valuation(i, 5)); lift(chinese(m, Mod(0, 2^k))) \\ Gives the last k decimal digits of n!.

is(n)=last(n, 2)==36 \\ Charles R Greathouse IV, Oct 22 2014

(PARI) is(n)=my(m=Mod(1, 25)); for(i=2, n, m*=i/10^valuation(i, 5)); m==36 \\ Charles R Greathouse IV, Oct 22 2014

(PARI) v=List(); m=Mod(1, 25); for(n=2, 1e6, m*=n/10^valuation(n, 5); if(m==36, listput(v, n); if(#v==100, return(Vec(v))))) \\ Charles R Greathouse IV, Oct 22 2014

CROSSREFS

Sequence in context: A052759 A226883 A304547 * A022761 A090386 A239596

Adjacent sequences:  A045555 A045556 A045557 * A045559 A045560 A045561

KEYWORD

nonn,base

AUTHOR

Jeff Burch

STATUS

approved

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Last modified August 19 21:33 EDT 2018. Contains 313896 sequences. (Running on oeis4.)