A141265 Concatenate first n factorials in reverse order.

1, 21, 621, 24621, 12024621, 72012024621, 504072012024621, 40320504072012024621, 36288040320504072012024621, 362880036288040320504072012024621

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Maple

P:=proc(i) local a, n; a:=1; print(1); for n from 2 by 1 to i do a:=n!*10^floor(evalf(1+log10(a), 1000))+a; print(a); od; end: P(15);

Mathematica

Table[FromDigits[Flatten[IntegerDigits/@Reverse[Range[n]!]]], {n, 10}] (* Harvey P. Dale, Apr 22 2022 *)

Crossrefs

Cf. A045508, A141266, A141267.

Sequence in context: A365744 A231852 A327681 * A025752 A163032 A209264

Adjacent sequences: A141262 A141263 A141264 * A141266 A141267 A141268

Keyword

nonn,base

Author

Paolo P. Lava, Jun 20 2008

Status

approved