1,1

Row 2 of A162663.

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

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

Cf. A000005, A000203, A035116, A162663.

Sequence in context: A334227 A080572 A263602 * A341706 A032689 A331489

Adjacent sequences: A162661 A162662 A162663 * A162665 A162666 A162667

nonn

Franklin T. Adams-Watters, Jul 09 2009

approved