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A037034 Least k such that 4*n*k-1 is a prime. 0
1, 1, 1, 2, 1, 1, 3, 1, 2, 2, 1, 1, 2, 3, 1, 2, 1, 1, 2, 1, 1, 3, 4, 2, 2, 1, 1, 2, 3, 2, 5, 1, 1, 2, 1, 3, 3, 1, 2, 3, 1, 1, 5, 7, 1, 2, 3, 1, 3, 1, 5, 5, 1, 2, 2, 1, 1, 2, 13, 1, 2, 3, 1, 5, 4, 1, 6, 1, 3, 3, 1, 3, 5, 3, 2, 2, 1, 1, 2, 4, 2, 3, 1, 7, 3, 3, 1, 5, 4, 1, 2, 1, 2, 2, 1, 1, 3, 4, 3, 5, 6, 3, 2, 4 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

EXAMPLE

a(5)=1 because 4*5*1-1=19 is a prime

CROSSREFS

Cf. A016014.

Sequence in context: A175488 A115758 A124734 * A139462 A131376 A025840

Adjacent sequences:  A037031 A037032 A037033 * A037035 A037036 A037037

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 17 13:18 EST 2012. Contains 206031 sequences.