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

0,1

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.

Sequence in context: A367504 A304450 A085345 * A265843 A276829 A032371

Adjacent sequences: A348771 A348772 A348773 * A348775 A348776 A348777

Keyword

nonn

Author

N. J. A. Sloane, Nov 07 2021

Status

approved