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A126286 a(1) = 2, a(n) = n * LeastPrimeFactor(n+1) / LeastPrimeFactor(n) 3
2, 3, 2, 10, 2, 21, 2, 12, 6, 55, 2, 78, 2, 21, 10, 136, 2, 171, 2, 30, 14, 253, 2, 60, 10, 39, 18, 406, 2, 465, 2, 48, 22, 85, 14, 666, 2, 57, 26, 820, 2, 903, 2, 66, 30, 1081, 2, 168, 14, 75, 34, 1378, 2, 135, 22, 84, 38, 1711, 2, 1830, 2, 93, 42, 160, 26, 2211, 2, 102, 46 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..69.

EXAMPLE

a(6) = (6 / LeastPrimeFactor(6)) * LeastPrimeFactor(7) = 21

CROSSREFS

Cf. A126287, A126288, A126289, A020639.

Sequence in context: A209998 A163204 A215269 * A126288 A205393 A075076

Adjacent sequences:  A126283 A126284 A126285 * A126287 A126288 A126289

KEYWORD

easy,nonn

AUTHOR

Lior Manor, Dec 25 2006

STATUS

approved

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Last modified June 18 03:02 EDT 2013. Contains 226328 sequences.