

A348244


Indices of 1's in A307720.


2



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
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OFFSET

1,2


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.
Sequence in context: A084324 A329529 A333456 * A066220 A348152 A009257
Adjacent sequences: A348241 A348242 A348243 * A348245 A348246 A348247


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Oct 16 2021


STATUS

approved



