a(n) = the smallest k such that k^2+1 = p*A002144(n)^2, p prime of A002144 .

Terms

a(0) =18a(1) =70a(2) =540a(3) =800a(4) =1486a(5) =2984a(6) =500a(7) =6760a(8) =776a(9) =4060a(10) =5604a(11) =4030a(12) =5744a(13) =1710a(14) =1744a(15) =46146a(16) =186174a(17) =162886a(18) =62064a(19) =32150a(20) =37416a(21) =16610a(22) =26884a(23) =15006a(24) =130026a(25) =58724