Pseudo-squares: a(n) = the least nonsquare positive integer which is 1 mod 8 and is a (nonzero) quadratic residue modulo the first n odd primes.
A002189
Pseudo-squares: a(n) = the least nonsquare positive integer which is 1 mod 8 and is a (nonzero) quadratic residue modulo the first n odd primes.
Terms
- a(0) =17a(1) =73a(2) =241a(3) =1009a(4) =2641a(5) =8089a(6) =18001a(7) =53881a(8) =87481a(9) =117049a(10) =515761a(11) =1083289a(12) =3206641a(13) =3818929a(14) =9257329a(15) =22000801a(16) =48473881a(17) =48473881a(18) =175244281a(19) =427733329a(20) =427733329a(21) =898716289a(22) =2805544681a(23) =2805544681a(24) =2805544681
External references
- oeis: A002189