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A163630 Numbers such that the two adjacent integers are a prime and 7 times a prime. 0
20, 22, 36, 48, 78, 90, 132, 162, 258, 330, 372, 468, 498, 510, 678, 708, 720, 750, 762, 888, 918, 972, 1098, 1170, 1212, 1380, 1560, 1602, 1758, 1800, 1980, 2052, 2178, 2220, 2358, 2442, 2472, 2610, 2682, 2778, 2862 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

a(2)=22 lies between 21=7*A000040(2) and 23=A000040(9).

a(3)=36 lies between 35=7*A000040(3) and 37=A000040(12).

CROSSREFS

Cf. A000040, A163492.

Sequence in context: A036227 A171953 A133260 * A033906 A139357 A104059

Adjacent sequences:  A163627 A163628 A163629 * A163631 A163632 A163633

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Aug 02 2009

EXTENSIONS

20 inserted, 62 removed, 90 added etc. by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2009

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Last modified February 17 23:58 EST 2012. Contains 206085 sequences.