A229500 Smaller of Fermi-Dirac twin primes (A229064) which are not the smaller of twin primes (A001359).

7, 9, 23, 47, 79, 81, 167, 359, 839, 1367, 1847, 2207, 2399, 3719, 5039, 6561, 7919, 10607, 11447, 14639, 16127, 17159, 19319, 28559, 29927, 36479, 44519, 49727, 54287, 57119, 66047, 85847, 97967, 113567, 128879, 177239, 196247, 201599, 218087, 241079, 273527

Offset: 1

Author

Vladimir Shevelev, Sep 25 2013

Keywords

• nonn

Comments

The sequence conjecturally infinite. All squares of the sequence are 9, 81, 6561,... and have the form 3^(2^k), k>=1. However, we conjecture that there is only a finite number of them, or, the same, there is only a finite number of primes of the form 3^(2^k) + 2.

Links

• Peter J. C. Moses, Table of n, a(n) for n = 1..1200

Crossrefs

Cf. A229064, A001359.

Extensions

More terms from Peter J. C. Moses, Sep 25 2013