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 A121764 Single (or isolated or non-twin) primes of form 6n + 1. 3
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS For the first 30000 terms a(n) > A121762(n), see plot A121764(n) - A121762(n). But is it so for all n? - Zak Seidov, Apr 25 2015 Subsequence of A002476. - Michel Marcus, Apr 26 2015 LINKS Zak Seidov, Table of n, a(n) for n = 1..10000 Zak Seidov, Plot of A121764(n) - A121762(n) MATHEMATICA Select[Table[6n + 1, {n, 200}], PrimeQ[#] && !PrimeQ[#-2] &] (* Ray Chandler, Aug 22 2006 *) PROG (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 CROSSREFS Cf. A007510, A121765, A002476, A121762, A038179, A007310, A038511. Sequence in context: A117475 A145486 A319673 * A131499 A217659 A054805 Adjacent sequences:  A121761 A121762 A121763 * A121765 A121766 A121767 KEYWORD nonn AUTHOR Lekraj Beedassy, Aug 20 2006 EXTENSIONS Extended by Ray Chandler, Aug 22 2006 STATUS approved

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Last modified May 6 19:52 EDT 2021. Contains 343586 sequences. (Running on oeis4.)