A239280 Powers of 2 that are sum of prime(k) + k for some k.

8, 16, 32, 4096

Offset

1,1

Comments

a(5) > 2^47. - Giovanni Resta, Mar 14 2014

a(5) > 2^62 if it exists. - Chai Wah Wu, Apr 28 2018

Links

Table of n, a(n) for n=1..4.

Example

3 + prime(3) = 8 = 2^3.
5 + prime(5) = 16 = 2^4.
9 + prime(9) = 32 = 2^5.
503 + prime(503) = 4096 = 2^12.

Crossrefs

Cf. A014688, A064371, A073856, A107606.

Sequence in context: A363014 A261976 A291124 * A043111 A043891 A331930

Adjacent sequences: A239277 A239278 A239279 * A239281 A239282 A239283

Keyword

nonn,more

Author

Zak Seidov, Mar 14 2014

Status

approved