Numbers k such that k^2 + 1 = p*q*r*s where p,q,r,s are distinct primes and the sum p+q+r+s is a perfect square.

A261530

Numbers k such that k^2 + 1 = p*q*r*s where p,q,r,s are distinct primes and the sum p+q+r+s is a perfect square.

Terms

    a(0) =173a(1) =187a(2) =477a(3) =565a(4) =965a(5) =1237a(6) =1277a(7) =1437a(8) =1525a(9) =1636a(10) =2452a(11) =2587a(12) =2608a(13) =2653a(14) =2827a(15) =2885a(16) =2971a(17) =3197a(18) =3388a(19) =3412a(20) =3435a(21) =3477a(22) =3848a(23) =3891a(24) =4188a(25) =4237a(26) =4492a(27) =4724a(28) =5333a(29) =5728

External references