Størmer numbers or arc-cotangent irreducible numbers: numbers k such that the largest prime factor of k^2 + 1 is >= 2*k.
A005528
Størmer numbers or arc-cotangent irreducible numbers: numbers k such that the largest prime factor of k^2 + 1 is >= 2*k.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =5a(4) =6a(5) =9a(6) =10a(7) =11a(8) =12a(9) =14a(10) =15a(11) =16a(12) =19a(13) =20a(14) =22a(15) =23a(16) =24a(17) =25a(18) =26a(19) =27a(20) =28a(21) =29a(22) =33a(23) =34a(24) =35a(25) =36a(26) =37a(27) =39a(28) =40a(29) =42
External references
- oeis: A005528