A094753 - OEIS

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A094753

Largest k such that (2n-1)/k + 2 as well as (2n-1)k + 2 are prime, or 0 if no such number exists.

2

1, 3, 1, 0, 9, 1, 0, 15, 1, 0, 21, 0, 5, 3, 1, 0, 33, 1, 0, 39, 1, 0, 45, 0, 0, 1, 0, 11, 57, 1, 0, 7, 1, 0, 1, 1, 0, 25, 7, 0, 81, 0, 17, 3, 0, 0, 0, 1, 0, 99, 1, 0, 105, 1, 0, 111, 0, 23, 117, 0, 0, 123, 1, 0, 1, 0, 0, 15, 1, 0, 0, 13, 5, 147, 1, 0, 3, 1, 0, 53, 1, 0, 15, 0, 0, 171, 0, 5, 1, 1, 0

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Subsidiary sequence: Indices of 0's in the above sequence.

LINKS

Robert Gerbicz, Aug 22 2006, Table of n, a(n) for n = 1..152

CROSSREFS

Sequence in context: A299614 A135871 A126178 * A355350 A221713 A261765

Adjacent sequences: A094750 A094751 A094752 * A094754 A094755 A094756

KEYWORD

nonn

AUTHOR

Amarnath Murthy, May 29 2004

EXTENSIONS

More terms from Robert Gerbicz, Aug 22 2006

STATUS

approved