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A067342 Sum of decimal digits of sum of divisors of n. 7
1, 3, 4, 7, 6, 3, 8, 6, 4, 9, 3, 10, 5, 6, 6, 4, 9, 12, 2, 6, 5, 9, 6, 6, 4, 6, 4, 11, 3, 9, 5, 9, 12, 9, 12, 10, 11, 6, 11, 9, 6, 15, 8, 12, 15, 9, 12, 7, 12, 12, 9, 17, 9, 3, 9, 3, 8, 9, 6, 15, 8, 15, 5, 10, 12, 9, 14, 9, 15, 9, 9, 15, 11, 6, 7, 5, 15, 15, 8, 15, 4, 9, 12, 8, 9, 6, 3, 9, 9, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences related to sigma(n)

FORMULA

a(n) = A007953(A000203(n)). - Michel Marcus, Dec 26 2013

EXAMPLE

n=100, sigma(100)=217, SumDigit(217)=10, a(100)=10.

MATHEMATICA

Array[Total[IntegerDigits[DivisorSigma[1, #]]]&, 90] (* Harvey P. Dale, Jan 02 2012 *)

PROG

(PARI) vector(80, n, sumdigits(sigma(n))) \\ Michel Marcus, Apr 08 2015

CROSSREFS

Cf. A000203, A007953, A077650, A175548.

Sequence in context: A248789 A105852 A190998 * A322656 A105827 A230289

Adjacent sequences:  A067339 A067340 A067341 * A067343 A067344 A067345

KEYWORD

nonn,base

AUTHOR

Labos Elemer, Jan 16 2002

EXTENSIONS

Offset corrected to 1 by Michel Marcus, Dec 26 2013

STATUS

approved

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Last modified October 23 23:11 EDT 2019. Contains 328379 sequences. (Running on oeis4.)