A069458 Twin pack primes.

3, 5, 7, 11, 13, 17, 19, 101, 103, 107, 109, 137, 139, 149, 151, 179, 181, 191, 193, 197, 199, 419, 421, 431, 433, 809, 811, 821, 823, 827, 829, 1019, 1021, 1031, 1033, 1049, 1051, 1061, 1063, 1481, 1483, 1487, 1489, 1871, 1873, 1877

Offset

1,1

Links

Table of n, a(n) for n=1..46.

Example

A twin pack of primes contains 2 or more pairs of twin primes, between which pairs there are no other primes. 137,139,149,151 are in the sequence because they are consecutive primes which belong to more than 1 twin pair. 29,31 are not because both the preceding prime 23 and the next prime 37 are non-twins.

Mathematica

Join[{3}, Flatten[Select[Partition[Prime[Range[300]], 4, 1], #[[2]]-#[[1]] == #[[4]]-#[[3]] == 2&]]// Union] (* Harvey P. Dale, Jan 13 2017 *)

Crossrefs

Cf. A001097, A069457.

Sequence in context: A353137 A060290 A096880 * A062280 A069467 A309739

Adjacent sequences: A069455 A069456 A069457 * A069459 A069460 A069461

Keyword

nonn

Author

Neil Fernandez, Mar 23 2002

Status

approved