A266951 Record values in A266948: least prime p such that p-2 and 6n-p are also prime.

0, 5, 7, 13, 31, 109, 139, 199, 241, 283, 601, 619, 643, 823, 859, 883, 1021, 1051, 1093, 1291, 1621, 1873, 1879, 1951, 2311, 3001, 3301, 3361, 3529, 3583, 3919, 3931, 4339, 5419, 5479, 5851, 6361

Offset

1,2

Comments

Goldbach conjecture related. The values of A266948(n) range theoretically between 2 and n. The smaller they are, the easier it was to find a suitable twin prime, and thus the more likely the conjecture "A266948(n) > 0 for all n > 1" holds. These record values vs. the respective indices A266950 yield an estimate for the growth of an upper bound.

Links

Table of n, a(n) for n=1..37.

Crossrefs

Cf. A266948, A266950.

Sequence in context: A101782 A288889 A168609 * A102903 A294064 A018464

Adjacent sequences: A266948 A266949 A266950 * A266952 A266953 A266954

Keyword

nonn,more

Author

M. F. Hasler, Jan 06 2016

Extensions

a(28)-a(37) from Pontus von Brömssen, Jan 06 2024

Status

approved