A067343 Sum of decimal digits of n equals sum of decimal digits of sum of divisors of n.

1, 15, 24, 64, 69, 78, 90, 114, 133, 147, 153, 186, 198, 258, 270, 276, 288, 306, 339, 360, 366, 393, 429, 474, 492, 495, 507, 522, 582, 588, 609, 618, 627, 639, 708, 717, 738, 762, 763, 801, 817, 834, 846, 871, 906, 933, 960, 978, 990, 1062, 1080, 1083

Offset: 1

Author

Labos Elemer, Jan 16 2002

Keywords

• base
• nonn

Crossrefs

Cf. A067342, A007953, A000203.

Programs

PARI

sd(n) = digs = digits(n); sum(i=1, #digs, digs[i]);
isok(n) = sd(n) == sd(sigma(n)); \\ Michel Marcus, Dec 26 2013

Formula

A067342(n) = A007953(A000203(n)) = A007953(n).