A274792 a(n) = smallest prime p(1) in a symmetrical constellation of n consecutive twin primes: p(1), p(1)+2, ..., p(n), p(n)+2.

3, 5, 5, 663569, 3031329797, 17479880417, 1855418882807417, 2640138520272677

Offset

1,1

Links

Table of n, a(n) for n=1..8.

N. Makarova and C. Rivera, Symmetrical compositions of consecutive twin primes.

Example

The list of two consecutive twin primes (5, 7, 11, 13) is symmetrical because 5+13 = 7+11. Thus a(2) = 5.
The list of three consecutive twin primes (5, 7, 11, 13, 17, 19) is symmetrical because 5+19 = 7+17 = 11+13. Thus a(3) = 5.

Crossrefs

Cf. A077800.

Sequence in context: A231809 A186969 A111950 * A243589 A178255 A154467

Adjacent sequences: A274789 A274790 A274791 * A274793 A274794 A274795

Keyword

nonn,more

Author

Natalia Makarova, Jul 07 2016

Extensions

a(7)-a(8) from Dmitry Petukhov, Jul 07 2016

Status

approved