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A121764
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Single (or isolated or non-twin) primes of form 6n + 1.
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3
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37, 67, 79, 97, 127, 157, 163, 211, 223, 277, 307, 331, 337, 367, 373, 379, 397, 409, 439, 457, 487, 499, 541, 547, 577, 607, 613, 631, 673, 691, 709, 727, 733, 739, 751, 757, 769, 787, 853, 877, 907, 919, 937, 967, 991, 997, 1009, 1039, 1069, 1087, 1117
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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Select[Table[6n + 1, {n, 200}], PrimeQ[#] && !PrimeQ[#-2] &] (* Ray Chandler, Aug 22 2006 *)
Select[Prime[Range[200]], Mod[#, 6]==1&&NoneTrue[#+{2, -2}, PrimeQ]&] (* Harvey P. Dale, Jul 16 2021 *)
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PROG
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(PARI) {is(n)=n%6==1 && isprime(n) && !isprime(n-2)}; \\ G. C. Greubel, Feb 26 2019
(Magma) [n: n in [1..1150] | (n mod 6 eq 1) and not IsPrime(n-2) and IsPrime(n)]; // G. C. Greubel, Feb 26 2019
(Sage) [n for n in (1..1150) if mod(n, 6)==1 and not is_prime(n-2) and is_prime(n)] # G. C. Greubel, Feb 26 2019
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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