A330554 Union of 2, A282178, and A330339.

2, 3, 7, 37, 43, 53, 79, 89, 107, 113, 1471, 1579, 1663, 3491, 3547, 3659, 3691, 3719, 3779, 3821, 3823, 3851, 3947, 3989, 4079, 4583, 4657, 4679, 4703, 27271, 28643, 28661, 28663, 28711, 29021, 29023, 41603, 41641, 41651, 41669, 41999, 42443, 42787, 42899, 44249, 44263, 44279, 45971, 50599, 50909, 56053, 57041

Offset: 1

Author

N. J. A. Sloane, Dec 22 2019

Keywords

• nonn

Comments

Equivalently, primes that occur in columns 0, 1, or 2 of the triangle in A330339. [Corrected by Walter Trump, Dec 23 2019]

The asymptotic behavior of A282178 and A330339 is a mystery. It is not even known if they are infinite. They are closely related. A282178 contains primes == 3 mod 4, and A330339 primes == 1 mod 4. Perhaps by combining them in this way some properties will become more visible.

Links

• Giovanni Resta, Table of n, a(n) for n = 1..25000 (first 1269 terms from N. J. A. Sloane)

Crossrefs

Cf. A282178, A330339, A330545, A330547.