A361563 -id:A361563 - cp's OEIS frontend

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A361562 Wagstaff numbers that are of the form 4*k + 3.

Original entry on oeis.org

3, 7, 11, 19, 23, 31, 43, 79, 127, 167, 191, 199, 347, 3539, 5807, 10691, 11279, 12391, 14479, 83339, 117239, 127031, 141079, 269987, 986191, 4031399

Offset: 1

Jorge Coveiro, Mar 15 2023

13347311 and 13372531 are also in the sequence, but may not be the next terms.

Jorge Coveiro, Possible 'Formula' for Wagstaff numbers, mersenneforum.org.

Cf. A000978 (Wagstaff numbers), A002145 (primes of form 4*k+3), A112633, A361563.

from itertools import count, islice
from sympy import prime, isprime
def A361562_gen(): # generator of terms
    return filter(lambda p: p&2 and isprime(((1<A361562_list = list(islice(A361562_gen(),10)) # Chai Wah Wu, Mar 21 2023

Intersection of A000978 and A002145.

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