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A116535 Smallest odd prime p such that 2^n + p is not prime. 0
3, 7, 5, 7, 5, 3, 5, 5, 3, 3, 3, 3, 5, 3, 3, 5, 5, 3, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 3, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

EXAMPLE

A000079(20) + a(20) = 1048576 + 3 = 1048579 = 7*163*919.

MATHEMATICA

Table[p := 2; While[PrimeQ[2^n + Prime[p]], p++ ]; Prime[p], {n, 0, 150}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Mar 28 2006

CROSSREFS

Cf. A000079, A000040.

Sequence in context: A107738 A010624 A019638 * A122001 A161327 A151685

Adjacent sequences:  A116532 A116533 A116534 * A116536 A116537 A116538

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 27 2006

EXTENSIONS

More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Mar 28 2006

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Last modified February 15 13:05 EST 2012. Contains 205789 sequences.