Fermat pseudoprimes to base 2 that are hexagonal.

Terms

a(0) =561a(1) =2701a(2) =4371a(3) =8911a(4) =10585a(5) =18721a(6) =33153a(7) =49141a(8) =93961a(9) =104653a(10) =115921a(11) =157641a(12) =226801a(13) =289941a(14) =314821a(15) =334153a(16) =534061a(17) =665281a(18) =721801a(19) =831405a(20) =873181a(21) =915981a(22) =1004653a(23) =1373653a(24) =1537381a(25) =1755001a(26) =1815465a(27) =1987021a(28) =2035153a(29) =2233441