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A005099
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(( Primes == -1 (mod 4) ) + 1)/4.
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7
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1, 2, 3, 5, 6, 8, 11, 12, 15, 17, 18, 20, 21, 26, 27, 32, 33, 35, 38, 41, 42, 45, 48, 50, 53, 56, 57, 60, 63, 66, 68, 71, 77, 78, 83, 87, 90, 92, 95, 96, 105, 108, 110, 111, 116, 117, 120, 122, 123, 125, 126, 131, 137, 141, 143, 147, 150, 152, 155, 158, 161, 162, 165
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OFFSET
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1,2
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COMMENTS
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Numbers k such that 4*k - 1 is prime. - Michel Marcus, Dec 10 2015
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LINKS
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FORMULA
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MATHEMATICA
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(Select[Prime@ Range@ 120, Mod[#, 4] == 3 &] + 1)/4 (* or *) Select[Range@165, PrimeQ[4 # - 1] &] (* Michael De Vlieger, Dec 10 2015 *)
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PROG
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(Magma) [ (p+1)/4: p in PrimesUpTo(700) | p mod 4 eq 3 ]; // Klaus Brockhaus, Dec 22 2008
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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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EXTENSIONS
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STATUS
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approved
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