A110487 Squares of the form p*q - p - q + 2, where p and q are primes.

9, 25, 49, 81, 121, 169, 225, 289, 361, 529, 625, 841, 961, 1225, 1369, 1521, 1681, 1849, 2025, 2209, 2401, 2601, 2809, 3025, 3481, 3721, 4225, 4489, 4761, 5041, 5329, 5929, 6241, 6889, 7225, 7921, 8281, 9025, 9409, 10201, 10609, 11449, 11881, 12769

Offset: 1

Author

Giovanni Teofilatto, Sep 11 2005

Keywords

• nonn

Comments

Includes A108570 squares of lesser twin primes and A110284 squares of form 4p-3 where p is prime (q=5).

Crossrefs

Cf. A108570, A110284, A110484.

Programs

Mathematica

Lim=13000;f[{p_,q_}]:=p*q-p-q+2;Union[Select[f/@Subsets[Prime[Range[PrimePi[Lim]]], {2}],#James C. McMahon, Apr 20 2024 *)

Extensions

Corrected and extended by Ray Chandler, Sep 13 2005