1,2

If p is an odd prime then a(p) = 3.

Antti Karttunen, Table of n, a(n) for n = 1..2049

(PARI) a(n)={vecsum(factor(polchebyshev(n, 1, x)-1)[, 2])} \\ Andrew Howroyd, Jul 10 2018

Cf. A086374.

Sequence in context: A290139 A317588 A080383 * A337532 A092089 A117659

Adjacent sequences: A086366 A086367 A086368 * A086370 A086371 A086372

nonn

Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 08 2003

a(14) corrected and a(21)-a(80) added by Andrew Howroyd, Jul 10 2018

approved