A224859 Numbers n such that 90*n + 47 and 90*n + 49 are twin primes.

1, 2, 9, 16, 18, 22, 29, 38, 39, 43, 50, 51, 87, 95, 107, 108, 109, 111, 121, 123, 134, 137, 143, 144, 155, 160, 162, 176, 178, 193, 195, 199, 200, 227, 230, 233, 237, 239, 240, 241, 247, 248, 251, 261, 262, 277, 304, 314, 324, 326, 328, 338, 339, 352, 363, 370

Offset: 1

Author

J. W. Helkenberg, Jul 22 2013

Keywords

• nonn

Comments

All matching entries for A201734 and A201818 are twin primes.

Links

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

Crossrefs

Cf. A201734, A201818.

Programs

Mathematica

Select[Range[0, 499], PrimeQ[90# + 47] && PrimeQ[90# + 49] &] (* copied from: Alonso del Arte, Jul 22 2013 *)
Select[Range[500],AllTrue[90#+{47,49},PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Oct 18 2015 *)

Formula

A201734 intersect A201818.