A054794 -id:A054794 - cp's OEIS frontend

A087681 Numbers n such that n + 6 and n - 6 are both prime.

11, 13, 17, 23, 25, 35, 37, 47, 53, 65, 67, 73, 77, 95, 103, 107, 133, 143, 145, 157, 173, 185, 187, 205, 217, 233, 235, 245, 257, 263, 275, 277, 287, 343, 353, 373, 395, 403, 415, 425, 427, 437, 455, 473, 485, 493, 497, 515, 563, 593, 607, 613, 625, 637, 647

Offset: 1

Zak Seidov, Sep 27 2003

Many terms are of the form 5 + n + n^2 or 5 + 2*n^2: A054794.

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Cf. A054794.

Cf. A014574, A087678-A087683, A087695-A087697, A088766.

f[n_]:=PrimeQ[n-6]&&PrimeQ[n+6]; lst={}; Do[If[f[n],AppendTo[lst,n]],{n,2,7!,1}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 12 2009 *)
Select[Range[2,700],AllTrue[#+{6,-6},PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Jan 26 2019 *)

A054795 Numbers of form 23+n^2+n or 23+2*n^2.

Original entry on oeis.org

23, 25, 29, 31, 35, 41, 43, 53, 55, 65, 73, 79, 95, 113, 121, 133, 151, 155, 179, 185, 205, 223, 233, 263, 265, 295, 311, 329, 361, 365, 403, 415, 443, 473, 485, 529, 535, 575, 601, 623, 671, 673, 725, 745, 779, 823, 835, 893, 905, 953, 991, 1015, 1079

Offset: 1

Stuart M. Ellerstein (ellerstein(AT)aol.com), Apr 27 2000

nonn

Cf. A052293, A054794, A054796.

More terms from James Sellers, Apr 28 2000

cp's OEIS Frontend

A087681 Numbers n such that n + 6 and n - 6 are both prime.

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A054795 Numbers of form 23+n^2+n or 23+2*n^2.

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