Perfect squares which can be written neither as a^2+b^2, nor as a^2+2*b^2, nor as a^2+3*b^2, nor as a^2+7*b^2, with a > 0 and b > 0.
A216408
Perfect squares which can be written neither as a^2+b^2, nor as a^2+2*b^2, nor as a^2+3*b^2, nor as a^2+7*b^2, with a > 0 and b > 0.
Terms
- a(0) =1a(1) =2209a(2) =27889a(3) =96721a(4) =146689a(5) =229441a(6) =253009a(7) =418609a(8) =516961a(9) =703921a(10) =786769a(11) =966289a(12) =1324801a(13) =1495729a(14) =1739761a(15) =2211169a(16) =2283121a(17) =2430481a(18) =3323329a(19) =3411409a(20) =4255969a(21) =4879681a(22) =5527201a(23) =5755201a(24) =7091569a(25) =7219969a(26) =8427409a(27) =8994001a(28) =9138529a(29) =10029889
External references
- oeis: A216408