1,1

All terms are odd.

If q > 7 is in A005385, then q^2 is in the sequence.

The sequence has a positive natural density. - Information from Carl Pomerance, Jan 07 2017

Amiram Eldar, Table of n, a(n) for n = 1..10000

Cf. A000010, A005385, A058340 (such primes).

Sequence in context: A223020 A357168 A253261 * A273372 A053887 A119943

Adjacent sequences: A280584 A280585 A280586 * A280588 A280589 A280590

nonn

Thomas Ordowski and Altug Alkan, Jan 06 2017

approved