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A153327
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Numbers n such that 16*n+5 is not prime.
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1
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1, 4, 5, 7, 8, 10, 13, 15, 16, 19, 20, 21, 22, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, 40, 43, 45, 46, 49, 50, 52, 54, 55, 56, 57, 58, 59, 60, 61, 64, 65, 67, 70, 71, 72, 73, 74, 75, 76, 78, 79, 80, 82, 83, 84, 85, 87, 88, 90, 91, 92, 94, 95, 96, 97, 98, 99, 100
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Distribution of the terms in the following triangular array:
*;
*,*;
1,*,*;
*,*,*,*;
*,*,*,*,*,;
*,*,*,7,*,*;
*,*,*,*,10,*,*;
*,5,*,*,*,*,*,*;
*,*,8,*,*,*,*,*,*;
*,*,*,*,*,*,*,22,*,*;
4,*,*,*,*,*,*,*,27*,*;
*,*,*,*,*,20,*,*,*,*,*,*;
*,*,*,*,*,*,25,*,*,*,*,*,*; etc.
where * marks the non-integer values of (2*h*k + k + h - 2)/8 with h >= k >= 1. - Vincenzo Librandi, Jan 17 2013
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MATHEMATICA
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Select[Range[100], !PrimeQ[16# + 5]&] (* Harvey P. Dale, Oct 03 2011 *)
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PROG
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(Magma) [n: n in [0..150] | not IsPrime(16*n + 5)]; // Vincenzo Librandi, Jan 12 2013
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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