A132243 - OEIS

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A132243

Twin primes congruent to {1, 29} mod 30.

29, 31, 59, 61, 149, 151, 179, 181, 239, 241, 269, 271, 419, 421, 569, 571, 599, 601, 659, 661, 809, 811, 1019, 1021, 1049, 1051, 1229, 1231, 1289, 1291, 1319, 1321, 1619, 1621, 1949, 1951, 2129, 2131, 2309, 2311, 2339, 2341, 2549, 2551, 2729, 2731, 2789

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Twin primes of the form 5n +- 1. [Bruno Berselli, Aug 26 2014]

LINKS

Roger L. Bagula, Table of n, a(n) for n = 1..144

C. K. Caldwell, The Prime Pages.

C. K. Caldwell, Twin Primes.

Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

MATHEMATICA

a[0] = 9; a[n_] := a[n] = a[n - 1] + 10; Flatten[Table[If[PrimeQ[a[n]] && PrimeQ[a[n] + 2], {a[n], a[n] + 2}, {}], {n, 0, 1000}]] - Roger L. Bagula, May 04 2008

Flatten[Select[#+{-1, 1}&/@(5*Range[0, 600, 2]), AllTrue[#, PrimeQ]&]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Feb 21 2020 *)

CROSSREFS

Cf. A001097, A001359, A006512, A039949, A129805, A132240.

Sequence in context: A288616 A273547 A132240 * A125523 A156976 A157681

Adjacent sequences: A132240 A132241 A132242 * A132244 A132245 A132246

KEYWORD

nonn,easy

AUTHOR

Omar E. Pol, Aug 15 2007

EXTENSIONS

More terms from Roger L. Bagula, May 04 2008

STATUS

approved