Numbers k coprime to 10 such that there are exactly two values of A for which k^2+4*A and k^2-4*A are perfect squares.
A325421
Numbers k coprime to 10 such that there are exactly two values of A for which k^2+4*A and k^2-4*A are perfect squares.
Terms
- a(0) =169a(1) =289a(2) =507a(3) =841a(4) =867a(5) =1183a(6) =1369a(7) =1521a(8) =1681a(9) =1859a(10) =2023a(11) =2523a(12) =2601a(13) =2809a(14) =3179a(15) =3211a(16) =3549a(17) =3721a(18) =3887a(19) =4107a(20) =4563a(21) =5043a(22) =5239a(23) =5329a(24) =5491a(25) =5577a(26) =5887a(27) =6069a(28) =6647a(29) =7267
External references
- oeis: A325421