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A154611 Numbers n such that 7n+3 is not prime. 0
1, 3, 5, 6, 7, 9, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 29, 30, 31, 33, 35, 36, 37, 39, 41, 42, 43, 45, 46, 47, 48, 49, 51, 53, 54, 55, 56, 57, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 70, 71, 72, 73, 75, 76, 77, 78, 79 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

Of course for all odd n 7n+3 is not prime. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jun 18 2010]

CROSSREFS

Cf. A089033, A045437, A017017

Sequence in context: A174415 A103826 A079905 * A189669 A164028 A047273

Adjacent sequences:  A154608 A154609 A154610 * A154612 A154613 A154614

KEYWORD

nonn

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 15 2009

EXTENSIONS

Erroneous comments deleted by N. J. A. Sloane, Jun 23 2010

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.