Positive integers k such that (k+1)^4 has a divisor congruent to -1 modulo k.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =9a(5) =11a(6) =14a(7) =17a(8) =29a(9) =35a(10) =41a(11) =43a(12) =59a(13) =65a(14) =69a(15) =125a(16) =134a(17) =139a(18) =174a(19) =194a(20) =339a(21) =386a(22) =449a(23) =461a(24) =681a(25) =901a(26) =937a(27) =1169a(28) =1322a(29) =1325