1,2

Seiichi Manyama, Table of n, a(n) for n = 1..10000

The divisors of 8 are 1, 2, 4, and 8. 8/1 == 0 (mod 4) and 8/2 == 0 (mod 4). Hence, a(8) = 4 + 8 = 12.

Cf. A002131 (k=2), A078708 (k=3), this sequence (k=4), A285896 (k=5).

Sequence in context: A158523 A001615 A133689 * A220345 A135510 A065967

Adjacent sequences: A285892 A285893 A285894 * A285896 A285897 A285898

nonn

Seiichi Manyama, Apr 28 2017

approved