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A153235 Numbers n such that 8n+7 is not prime +0
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1, 4, 6, 7, 10, 11, 13, 14, 16, 17, 19, 21, 22, 25, 26, 28, 30, 31, 34, 35, 36, 37, 39, 40, 41, 42, 43, 46, 48, 49, 50, 51, 52, 55, 56, 58, 61, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 76, 77, 79, 81, 82, 83, 84, 85, 86, 87, 88, 91, 94, 95, 96, 97, 98, 99, 100, 101 (list; graph; listen)
OFFSET

1,2

FORMULA

Let p = prime number; n=(p^2+2p-7)/8 mod.p); or n=(p^2+6p-7)/8 mod (p)

CROSSREFS

Cf. A139487

Sequence in context: A087790 A086170 A123088 this_sequence A133483 A153082 A026147

Adjacent sequences: A153232 A153233 A153234 this_sequence A153236 A153237 A153238

KEYWORD

nonn

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 21 2008

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.


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