1,2

The conjecture in A156695 implies that each term greater than 1 can be written in the form p + 2^x, where p is a prime. For example: 144465 - 2^2 = 144461 (a prime), 4330455 - 2^8 = 4330199 (a prime).

Table of n, a(n) for n=1..6.

Cf. A156695, A268693.

Sequence in context: A073691 A110336 A073695 * A068825 A097911 A019730

Adjacent sequences: A268691 A268692 A268693 * A268695 A268696 A268697

nonn,more

Arkadiusz Wesolowski, Feb 11 2016

approved