A095192 Smallest semiprime with same leading digits as n!.

10, 21, 62, 247, 1202, 7201, 50401, 403201, 3628801, 36288001, 399168002, 4790016001, 62270208001, 871782912007, 130767436800017, 209227898880001, 3556874280960001, 64023737057280001, 12164510040883200031

Offset

1,1

Links

Table of n, a(n) for n=1..19.

Mathematica

ssp[n_]:=Module[{f=n!, k=0}, While[PrimeOmega[10^Max[IntegerLength[k], 1] f+k]!=2, k++]; 10^Max[1, IntegerLength[k]] f+k]; Array[ssp, 20] (* Harvey P. Dale, May 05 2019 *)

Crossrefs

Cf. A068844, A001358.

Sequence in context: A156592 A045973 A095679 * A356761 A096564 A041196

Adjacent sequences: A095189 A095190 A095191 * A095193 A095194 A095195

Keyword

base,nonn

Author

Jason Earls, Jun 21 2004

Status

approved