login
A071422
a(n) = a(n-1) + sum of decimal digits of sigma(n), the sum of divisors of n.
1
1, 4, 8, 15, 21, 24, 32, 38, 42, 51, 54, 64, 69, 75, 81, 85, 94, 106, 108, 114, 119, 128, 134, 140, 144, 150, 154, 165, 168, 177, 182, 191, 203, 212, 224, 234, 245, 251, 262, 271, 277, 292, 300, 312, 327, 336, 348, 355, 367, 379, 388, 405, 414, 417, 426, 429
OFFSET
1,2
LINKS
MATHEMATICA
s=0; Do[s=s+Apply[Plus, IntegerDigits[DivisorSigma[1, n]]]; Print[s], {n, 1, 128}]
nxt[{n_, a_}]:={n+1, a+Total[IntegerDigits[DivisorSigma[1, n+1]]]}; Transpose[ NestList[nxt, {1, 1}, 60]][[2]] (* Harvey P. Dale, Jan 25 2013 *)
CROSSREFS
Partial sums of A067342.
Sequence in context: A312751 A312752 A312753 * A368897 A212538 A113902
KEYWORD
base,easy,nonn
AUTHOR
Labos Elemer, May 27 2002
STATUS
approved