A077650 -id:A077650 - cp's OEIS frontend

A067342 Sum of decimal digits of sum of divisors of n.

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

Offset: 1

Labos Elemer, Jan 16 2002

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

Antti Karttunen, Table of n, a(n) for n = 1..10000
Index entries for sequences related to sigma(n)

Cf. A000203, A007953, A077650, A175548.

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

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

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

Offset corrected to 1 by Michel Marcus, Dec 26 2013

A134688 Successive digits of the terms of A000203, the sum-of-divisors function.

Original entry on oeis.org

1, 3, 4, 7, 6, 1, 2, 8, 1, 5, 1, 3, 1, 8, 1, 2, 2, 8, 1, 4, 2, 4, 2, 4, 3, 1, 1, 8, 3, 9, 2, 0, 4, 2, 3, 2, 3, 6, 2, 4, 6, 0, 3, 1, 4, 2, 4, 0, 5, 6, 3, 0, 7, 2, 3, 2, 6, 3, 4, 8, 5, 4, 4, 8, 9, 1, 3, 8, 6, 0, 5, 6, 9, 0, 4, 2, 9, 6

Offset: 1

Omar E. Pol, Nov 06 2007

Robert Israel, Table of n, a(n) for n = 1..10000
Paul Pollack, Joseph Vandehey, Besicovitch, Bisection, and the normality of 0.(1)(4)(9)(16)(25)..., arXiv:1405.6266 [math.NT], 2014.
Paul Pollack, Joseph Vandehey, Besicovitch, Bisection, and the Normality of 0.(1)(4)(9)(16)(25)..., The American Mathematical Monthly 122.8 (2015): 757-765.
Paul Pollack, Joseph Vandehey, Some normal numbers generated by arithmetic functions, arXiv:1309.7386 [math.NT], 2013.

Cf. A000203, A077650.

map(t -> op(ListTools[Reverse](convert(numtheory:-sigma(t),base,10))), [$1..100]); # Robert Israel, Nov 27 2015

Flatten@ Map[IntegerDigits, Array[DivisorSigma[1, #] &, {42}]] (* Michael De Vlieger, Nov 28 2015 *)
Flatten[IntegerDigits/@DivisorSigma[1,Range[60]]] (* Harvey P. Dale, Apr 06 2018 *)

cp's OEIS Frontend

A067342 Sum of decimal digits of sum of divisors of n.

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