A112529 Numbers n such that prime(n) +/- 2n are both primes.

7, 9, 12, 24, 30, 36, 63, 90, 102, 117, 126, 135, 150, 156, 165, 171, 180, 183, 225, 234, 270, 285, 369, 390, 399, 402, 447, 456, 501, 507, 537, 570, 582, 624, 627, 642, 651, 654, 660, 720, 735, 762, 777, 855, 864, 870, 885, 930, 936, 945, 1023, 1029, 1035

Offset: 1

Author

Zak Seidov, Sep 10 2005

Keywords

• nonn

Comments

Cf. A064403: Prime(n) +/- n are both primes

Crossrefs

Cf. A064403.

Programs

Mathematica

Select[Range[2000], PrimeQ[Prime[ # ]+2# ]&&PrimeQ[Prime[ # ]-2# ]&]