A137582 Numbers having no inner zeros in decimal representation of their factorial.
0, 1, 2, 3, 4, 5, 6, 9, 10, 11, 14, 31, 40
Offset: 1
Examples
A000142(a(10)) = 11! = 399168*10^2; A000142(a(11)) = 14! = 871782912*10^2; A000142(a(12)) = 31! = 822283865417792281772556288*10^7.
Programs
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PARI
isok(k) = my(f=k!); while(!(f % 10), f \= 10); #select(x->(x == 0), digits(f)) == 0; \\ Michel Marcus, Jun 28 2023
Formula
A137581(a(n)) = 0.
Comments