A162664 a(n) = sigma(n) + tau(n)^2.

2, 7, 8, 16, 10, 28, 12, 31, 22, 34, 16, 64, 18, 40, 40, 56, 22, 75, 24, 78, 48, 52, 28, 124, 40, 58, 56, 92, 34, 136, 36, 99, 64, 70, 64, 172, 42, 76, 72, 154, 46, 160, 48, 120, 114, 88, 52, 224, 66, 129, 88, 134, 58, 184, 88, 184, 96, 106, 64, 312, 66, 112, 140, 176, 100

Offset: 1

Author

Franklin T. Adams-Watters, Jul 09 2009

Keywords

• nonn

Comments

Row 2 of A162663.

Links

• Shawn A. Broyles, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000005, A000203, A035116, A162663.

Programs

Mathematica

Table[DivisorSigma[1, n] + DivisorSigma[0, n]^2, {n, 65}] (* Robert A. Russell, Apr 28 2018 *)

PARI

a(n) = sigma(n) + numdiv(n)^2; \\ Michel Marcus, Apr 28 2018