1,3

Table of n, a(n) for n=1..68.

a(5) = 13 because 13 is the smallest number such that sum of digits of all its divisors is equal to 5: 1 + 1 + 3 = 5.

a(2) = a(10) = 0 because there is no number such that sum of digits of all its divisors is equal to 2 or 10.

Cf. A034690

Sequence in context: A067180 A067182 A342667 * A085402 A085400 A067523

Adjacent sequences: A190997 A190998 A190999 * A191001 A191002 A191003

nonn,base

Jaroslav Krizek, Jun 15 2011

approved