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A174272 Exactly one of 2^n-3 and 2^n+3 is prime. 0
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 (list; graph; refs; listen; history; text; internal format)
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: A186155 A181713 A047482 * 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

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Last modified August 7 19:57 EDT 2020. Contains 336279 sequences. (Running on oeis4.)