A361562 -id:A361562 - cp's OEIS frontend

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A361563 Wagstaff numbers that are of the form 4*k + 1.

Original entry on oeis.org

5, 13, 17, 61, 101, 313, 701, 1709, 2617, 10501, 42737, 95369, 138937, 267017, 374321

Offset: 1

Jorge Coveiro, Mar 15 2023

15135397 is also in the sequence, but may not be the next term.

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

Cf. A000978 (Wagstaff numbers), A002144 (primes of form 4*k + 1), A112634, A361562.

from itertools import count, islice
from sympy import prime, isprime
def A361563_gen(): # generator of terms
    return filter(lambda p: not p&2 and isprime(((1<A361563_list = list(islice(A361563_gen(),7)) # Chai Wah Wu, Mar 21 2023

Intersection of A000978 and A002144.

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