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Search: id:A153053
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| A153053 |
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Numbers n such that 2*n+7 is not a prime |
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+0
2
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| 1, 4, 7, 9, 10, 13, 14, 16, 19, 21, 22, 24, 25, 28, 29, 31, 34, 35, 37, 39, 40, 42, 43, 44, 46, 49, 52, 54, 55, 56, 57, 58, 59, 61, 63, 64, 67, 68, 69, 70, 73, 74, 76, 77, 79, 81, 82, 84, 85, 88, 89, 90, 91, 94, 97, 98, 99, 100
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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Let p = prime number n = (p^2-7)/2 mod (p)
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EXAMPLE
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1; 4, 9; 7, 14, 21; 10, 19, 28, 37; 13, 24, 35, 46, 57; 16, 29, 42, 55, 68, 81;
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CROSSREFS
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Cf. A105760
Sequence in context: A123573 A085746 A081828 this_sequence A045752 A010380 A056991
Adjacent sequences: A153050 A153051 A153052 this_sequence A153054 A153055 A153056
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 17 2008
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