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A153329 Numbers n such that 5n+1 is not prime +0
2
1, 3, 4, 5, 7, 9, 10, 11, 13, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 27, 28, 29, 31, 32, 33, 34, 35, 37, 39, 40, 41, 43, 44, 45, 46, 47, 49, 51, 52, 53, 55, 57, 58, 59, 60, 61, 63, 64, 65, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 82, 83, 85, 87, 88, 89, 90, 91 (list; graph; listen)
OFFSET

1,2

COMMENT

Of course n is odd.

FORMULA

Let p = prime number, n=(p^2-1)/5 mod (p); n=(p^2+4p-1)/5 mod (p); n=(p^2+6p-1)/5 mod (p)

CROSSREFS

Cf. A024894

Sequence in context: A081606 A079945 A039017 this_sequence A047251 A136495 A156246

Adjacent sequences: A153326 A153327 A153328 this_sequence A153330 A153331 A153332

KEYWORD

nonn

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 23 2008

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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