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A045557 Numbers n such that final 2 nonzero digits of n! are '32'. 1
8, 19, 35, 74, 85, 97, 118, 145, 148, 180, 203, 225, 226, 270, 273, 287, 299, 306, 314, 325, 326, 337, 350, 351, 375, 376, 434, 441, 447, 457, 470, 473, 482, 509, 510, 516, 533, 544, 627, 659, 661, 666, 711, 718, 747, 806, 814, 842, 849 (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)==32 \\ 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==32 \\ 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==32, listput(v, n); if(#v==100, return(Vec(v))))) \\ Charles R Greathouse IV, Oct 22 2014

CROSSREFS

Sequence in context: A262713 A135027 A158916 * A289877 A089111 A127873

Adjacent sequences:  A045554 A045555 A045556 * A045558 A045559 A045560

KEYWORD

nonn,base

AUTHOR

Jeff Burch

STATUS

approved

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Last modified November 16 17:04 EST 2019. Contains 329201 sequences. (Running on oeis4.)