A232236 Primes that can be written in binary representation as concatenation of two primes: p and p+2. That is, primes representable as p * 2^L + p+2, where p and p+2 are primes, and L is the length of binary representation of p+2: L = A070939(p+2).

29, 47, 563, 9161, 137999, 2149403, 2358401, 3526331, 41776109, 43250849, 46347803, 51607709, 53819819, 55540349, 59866253, 62176679, 539082821, 545571083, 546947381, 625199753, 627165893, 629525261, 650169731, 654102011, 680644901, 687526391, 688509461, 690082373

Offset: 1

Author

Alex Ratushnyak, Nov 20 2013

Keywords

• nonn
• base
• less

Comments

A subsequence of A232085.

Crossrefs

Cf. A000040, A070939, A232085.

Formula

a(n) = A232238(n) * 2^A070939(A232238(n)+2) + A232238(n)+2.