A348244 Indices of 1's in A307720.

1, 2, 4, 6, 48, 50, 52, 54, 56, 58, 1375, 1377, 1379, 1381, 1383, 1385, 1387, 1389, 1391, 1393, 1395, 1397, 3739, 3741, 3743, 3745, 3747, 3749, 3751, 3753, 3755, 3757, 3759, 3761, 3763, 3765, 3767, 3769, 3771, 3773, 6681, 6683, 6685, 6687, 6689, 6691, 6693, 6695, 6697, 6699, 6701, 6703, 6705

Offset: 1

Author

N. J. A. Sloane, Oct 16 2021

Keywords

• nonn

Comments

Theorem: This sequence is infinite. Proof: Every prime in A307720 is immediately preceded or followed by a 1. - N. J. A. Sloane, Oct 30 2021

The start of this sequence consists of arithmetic progressions of constant difference 2 and lengths 1, 3, 6, 12, 18, 26, 76, ... that start with 1, 2, 48, 1375, 3739, 6681, 84627, 91833, ... It would be nice to have an alternative way to explain these numbers.

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..927

Crossrefs

Cf. A307720.