A308516 Odd numbers which are not squares and cannot be written as a sum of a prime and a square.

85, 91, 771, 1255, 1351, 21679

Offset

1,1

Comments

The sequence is probably finite. a(7) > 2000000 (if it exists).

a(7) > 1.5*10^11, if it exists. - Giovanni Resta, Jul 16 2019

Links

Table of n, a(n) for n=1..6.

Crossrefs

A subsequence of A020495.

Cf. A014090, A065377.

Sequence in context: A020312 A156650 A044978 * A095593 A039487 A157469

Adjacent sequences: A308513 A308514 A308515 * A308517 A308518 A308519

Keyword

nonn,more

Author

Daniel Starodubtsev, Jun 03 2019

Status

approved