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A153347 Numbers n such that 7n-4 is not prime 0
2, 4, 6, 7, 8, 10, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 30, 31, 32, 34, 36, 37, 38, 40, 42, 43, 44, 46, 47, 48, 49, 50, 52, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 76, 77, 78, 79, 80, 82, 84, 85, 86, 87, 88, 90, 91, 92 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Of course for all even n 7n-4 is not prime [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jun 18 2010]

CROSSREFS

Cf. A024903

Sequence in context: A138204 A080645 A024413 * A153167 A047237 A039028

Adjacent sequences:  A153344 A153345 A153346 * A153348 A153349 A153350

KEYWORD

nonn

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 24 2008

EXTENSIONS

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

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.