A121762 Single (or isolated or non-twin) primes of form 6n-1.

23, 47, 53, 83, 89, 113, 131, 167, 173, 233, 251, 257, 263, 293, 317, 353, 359, 383, 389, 401, 443, 449, 467, 479, 491, 503, 509, 557, 563, 587, 593, 647, 653, 677, 683, 701, 719, 743, 761, 773, 797, 839, 863, 887, 911, 929, 941, 947, 953, 971, 977, 983, 1013

Offset

1,1

Comments

Subsequence of A007528. - Michel Marcus, Apr 26 2015

Links

Zak Seidov, Table of n, a(n) for n = 1..10000

Mathematica

Select[Table[6n - 1, {n, 200}], PrimeQ[ # ] && ! PrimeQ[ # + 2] &] (* Ray Chandler, Aug 22 2006 *)

Prog

(PARI) is(n)=n%6==5 && isprime(n) && !isprime(n+2) \\ Charles R Greathouse IV, Apr 04 2016
(Magma) [n: n in [1..1050] | (n mod 6 eq 5) and not IsPrime(n+2) and  IsPrime(n)]; // G. C. Greubel, Feb 26 2019
(Sage) [n for n in (1..1050) if mod(n, 6)==5 and not is_prime(n+2) and  is_prime(n)] # G. C. Greubel, Feb 26 2019

Crossrefs

Cf. A007510, A121763, A007528, A121764.

Sequence in context: A253177 A109996 A188833 * A185935 A052159 A097361

Adjacent sequences: A121759 A121760 A121761 * A121763 A121764 A121765

Keyword

nonn

Author

Lekraj Beedassy, Aug 20 2006

Extensions

Extended by Ray Chandler, Aug 22 2006

Status

approved