1,1

a(n) + 2^floor(log_2(a(n))) = A152085(n).

If a(n) is written in binary and the leftmost 1 is replaced with "10", then we would have the binary representation of A152085(n), which is a prime.

Sequence A091932 contains the related primes p where p - 2^floor(log_2(p)) = prime.

Table of n, a(n) for n=1..51.

A152085, A091932

Sequence in context: A318263 A213740 A267357 * A274134 A131588 A091938

Adjacent sequences: A152081 A152082 A152083 * A152085 A152086 A152087

nonn

Leroy Quet, Nov 23 2008

Extended by Ray Chandler, Nov 26 2008

approved