1,2

a(11) is the first term where neither j or k is prime.

A301591 is contained in this sequence.

Table of n, a(n) for n=1..65.

1 is a term since A023900(1) + A023900(2) = 0 and gcd(1,2) = 1.

185 is a term since A023900(185) + A023900(273) = 0 and gcd(185,273) = 1.

Cf. A023900, A301591, A301374.

Sequence in context: A281004 A088963 A301591 * A220462 A280997 A185006

Adjacent sequences: A301854 A301855 A301856 * A301858 A301859 A301860

nonn

Torlach Rush, Mar 27 2018

approved