Nonprimes n such that Mod(n,4) == 1 and denominator(Fibonacci((n-1)/4)/n) = 1.

Terms

a(0) =1a(1) =4181a(2) =6721a(3) =13201a(4) =34561a(5) =51841a(6) =64681a(7) =90061a(8) =96049a(9) =97921a(10) =163081a(11) =186961a(12) =197209a(13) =268801a(14) =283361a(15) =302101a(16) =330929a(17) =399001a(18) =489601a(19) =520801a(20) =636641a(21) =655201a(22) =920577a(23) =999941a(24) =1034881a(25) =1072513a(26) =1081649a(27) =1084201a(28) =1106561a(29) =1317121