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A037039 Least k such that 4*n*k+1 is a prime. 0
1, 2, 1, 1, 2, 3, 1, 3, 1, 1, 2, 2, 1, 2, 1, 3, 2, 1, 3, 3, 4, 1, 3, 1, 1, 3, 1, 1, 2, 2, 3, 2, 3, 1, 2, 3, 1, 3, 1, 4, 5, 2, 1, 2, 1, 7, 5, 1, 1, 2, 2, 6, 5, 2, 3, 2, 1, 1, 3, 1, 3, 6, 3, 1, 2, 5, 1, 5, 1, 1, 2, 2, 1, 2, 2, 4, 2, 1, 1, 2, 4, 7, 3, 1, 3, 3, 1, 1, 3, 5, 3, 9, 1, 3, 2, 2, 1, 8, 1, 1, 2, 1, 3, 3, 1 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

EXAMPLE

a(5)=2 because for n=5: 4*5*2+1=41 is a prime.

CROSSREFS

Cf. A016014.

Sequence in context: A097868 A025830 A083796 * A182972 A153452 A090680

Adjacent sequences:  A037036 A037037 A037038 * A037040 A037041 A037042

KEYWORD

nonn

AUTHOR

Felice Russo (frusso(AT)micron.com)

EXTENSIONS

More terms from Erich Friedman (erich.friedman(AT)stetson.edu)

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Last modified February 15 12:21 EST 2012. Contains 205785 sequences.