A174272 Exactly one of 2^n-3 and 2^n+3 is prime.

1, 2, 5, 7, 9, 10, 14, 15, 16, 18, 20, 22, 24, 28, 29, 30, 55, 67, 84, 94, 116, 122, 150, 174, 213, 221, 228, 233, 266, 336, 390, 452, 545, 689, 694, 784, 850, 1110, 1704, 1736, 2008, 2139, 2191, 2321, 2367, 2370, 3237, 3954, 4002, 4060, 4062, 4552, 5547, 5630

Offset

1,2

Comments

Numbers n which are in A050414 or in A057732 but not in both. [From R. J. Mathar, Mar 29 2010]

Links

Table of n, a(n) for n=1..54.

Example

a(1)=1 because 2^1-3=-1 is nonprime and 2^1+3=5 is prime.

Crossrefs

Cf. A050414, A057732.

Sequence in context: A181713 A047482 A367491 * A062288 A077059 A260166

Adjacent sequences: A174269 A174270 A174271 * A174273 A174274 A174275

Keyword

nonn

Author

Juri-Stepan Gerasimov, Mar 14 2010

Extensions

Corrected by Charles R Greathouse IV, Mar 20 2010

Status

approved