A349597 a(n) is the sum of digits of a(n-1)! with a(1) = 3.

3, 6, 9, 27, 108, 666, 6327, 88263, 1692585, 42219558, 1318791681

Offset: 1

Author

Arkady Pogostkin, Nov 22 2021

Keywords

• nonn
• base
• more

Crossrefs

Subsequence of A008585.

Cf. A004152.

Programs

Mathematica

nterms=10;NestList[Total[IntegerDigits[#!]]&,3,nterms-1] (* Paolo Xausa, Nov 30 2021 *)

Formula

a(n) = sumdigits(a(n-1)!) for n > 1.

Extensions

a(10)-a(11) from Amiram Eldar, Nov 23 2021