A127554 Sum of the digits of left factorial !n.

0, 1, 2, 4, 1, 7, 10, 19, 19, 19, 19, 28, 37, 37, 55, 55, 37, 46, 46, 73, 73, 64, 82, 100, 100, 118, 109, 100, 127, 127, 145, 118, 163, 145, 154, 172, 172, 154, 181, 181, 199, 172, 226, 208, 253, 226, 262, 262, 253, 271, 235, 271, 262, 280, 325, 325, 307, 343, 334

Offset

0,3

Links

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Formula

a(n) = A007953(A003422(n)). - R. J. Mathar, Apr 22 2007

Example

!5 = 0!+1!+2!+3!+4! = 1+1+2+6+24 = 34 --> 3+4=7.

Maple

P:=proc(n) local a, i, k, w; a:=0; for i from 1 by 1 to n do w:=0; k:=(i-1)!+a; a:=k; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; print(w); od; end: P(100);

Crossrefs

Cf. A003422, A004152, A007953.

Sequence in context: A121531 A367065 A360180 * A182319 A204182 A103324

Adjacent sequences: A127551 A127552 A127553 * A127555 A127556 A127557

Keyword

easy,nonn,base

Author

Paolo P. Lava and Giorgio Balzarotti, Apr 17 2007

Status

approved