A346368 Odd numbers that can be written in a single way as 2*k^2+p, k>0, p prime.

5, 7, 9, 11, 23, 27, 29, 33, 41, 47, 53, 57, 59, 65, 71, 83, 95, 107, 113, 123, 143, 149, 161, 197, 233, 239, 257, 281, 287, 317, 323, 347, 383, 407, 413, 443, 449, 569, 743, 773, 785, 863, 1227, 1367, 1415, 1703, 1787, 2123, 2507, 2933, 3317, 3515, 3713, 4673, 5987, 6797

Offset

1,1

Comments

The next element, if it exists, is greater than 10^8.

Links

Table of n, a(n) for n=1..56.

Prog

(PARI) isok(m) = (m>3) && (m % 2) && (sum(i=1, sqrtint((m-3)/2), isprime(m-2*i^2)) == 1); \\ Michel Marcus, Jul 22 2021

Crossrefs

Cf. A060003, A046920, A046921, A046923,

Sequence in context: A024910 A283771 A045236 * A029664 A188793 A343525

Adjacent sequences: A346365 A346366 A346367 * A346369 A346370 A346371

Keyword

nonn

Author

Bernard Pitie, Jul 14 2021

Status

approved