Least odd k such that (k*2^n)^2+k*2^n-1 is the first of twin primes with n>0.

Terms

a(0) =1a(1) =5a(2) =1a(3) =11a(4) =9a(5) =89a(6) =25a(7) =359a(8) =187a(9) =11a(10) =145a(11) =309a(12) =559a(13) =47a(14) =115a(15) =41a(16) =87a(17) =1169a(18) =271a(19) =41a(20) =565a(21) =1005a(22) =1231a(23) =245a(24) =783a(25) =185a(26) =61a(27) =431a(28) =153a(29) =1205