A348774 A348773(2*n+1).

2, 6, 12, 18, 24, 32, 42, 48, 60, 68, 74, 84, 98, 104, 110, 128, 138, 150, 158, 168, 180, 192, 198, 212, 228, 234, 242, 258, 270, 278, 284, 308, 314, 332, 348, 354, 368, 380, 390, 402, 420, 432, 440, 450, 462, 468, 488, 500, 510, 524, 548, 564, 572, 588, 600, 608, 618, 632, 644, 654

Offset: 0

Author

N. J. A. Sloane, Nov 07 2021

Keywords

• nonn

Comments

The first differences are 4, 6, 6, 6, 8, ... and apart from the initial term4, appears to coincide with A155067, the differences between successive odd-indexed primes. If confirmed, this will be one of the few formulas known for A307720.

The other bisection of A348773, A348775, seems much more mysterious.

Links

• N. J. A. Sloane, Table of n, a(n) for n = 0..613

Crossrefs

Cf. A155067, A307720, A307730, A307632, A348773, A348775.