1,1

Contains no primes q and no doubled primes 2q.

Are there infinitely many such numbers?

Max Alekseyev, Table of n, a(n) for n = 1..829

Cf. A000040, A000225, A060443, A292188.

Contains A291855.

Sequence in context: A112819 A070684 A295152 * A269308 A167306 A061840

Adjacent sequences: A292196 A292197 A292198 * A292200 A292201 A292202

nonn

Thomas Ordowski, Sep 11 2017

Terms a(19) onward from Max Alekseyev, Sep 13 2017

approved