Numbers k such that sqrt(-1) mod k exists; or, numbers that are primitively represented by x^2 + y^2.
A008784
Numbers k such that sqrt(-1) mod k exists; or, numbers that are primitively represented by x^2 + y^2.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =10a(4) =13a(5) =17a(6) =25a(7) =26a(8) =29a(9) =34a(10) =37a(11) =41a(12) =50a(13) =53a(14) =58a(15) =61a(16) =65a(17) =73a(18) =74a(19) =82a(20) =85a(21) =89a(22) =97a(23) =101a(24) =106a(25) =109a(26) =113a(27) =122a(28) =125a(29) =130
External references
- oeis: A008784