1,1

Values taken from A103309 (Robert Israel).

If there should be no prime primitive root for A193305(n) then a(n) = 0.

Table of n, a(n) for n=1..58.

n = 1: 2^k (mod 4) is never 1 for k >=1. 3^1 = 3, 3^2 = 3^phi(4) = 9 == 1 (mod 4).

Cf. A103309, A193305.

Sequence in context: A076562 A306220 A057673 * A241429 A200109 A156060

Adjacent sequences: A279395 A279396 A279397 * A279399 A279400 A279401

nonn

Wolfdieter Lang, Jan 18 2017

approved