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A127554 Sum of the digits of left factorial !n. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..58.

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.

Sequence in context: A105552 A112852 A121531 * 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

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Last modified November 22 20:13 EST 2014. Contains 249827 sequences.