a(n) is the least number x such that x^2 + 1 and 2^x + 1 are both divisible by A387595(n).

Terms

a(0) =0a(1) =2a(2) =18a(3) =4a(4) =70a(5) =450a(6) =50a(7) =182a(8) =1170a(9) =18a(10) =216a(11) =4050a(12) =1602a(13) =98a(14) =374a(15) =742a(16) =4514a(17) =286a(18) =1118a(19) =12870a(20) =882a(21) =6288a(22) =16562a(23) =1710a(24) =900a(25) =2040a(26) =182a(27) =14070a(28) =3818a(29) =5005