Least integer k > 1 such that pi(k)^2 + pi(k*n)^2 is a square, where pi(.) is the prime-counting function given by A000720.

A255677

Least integer k > 1 such that pi(k)^2 + pi(k*n)^2 is a square, where pi(.) is the prime-counting function given by A000720.

Terms

    a(0) =5a(1) =30a(2) =8458a(3) =18a(4) =252a(5) =25a(6) =1407a(7) =476a(8) =9098a(9) =108a(10) =1814a(11) =1868a(12) =153a(13) =1005a(14) =67a(15) =26532a(16) =1592a(17) =200a(18) =963a(19) =99a(20) =833a(21) =1356a(22) =3869a(23) =981a(24) =531a(25) =127a(26) =4961a(27) =366a(28) =1192a(29) =1873

External references