Nonprime numbers k such that k divides 3^((k+1)/2) - 2^((k+1)/2) - 1.

Terms

a(0) =1a(1) =21a(2) =49a(3) =105a(4) =1729a(5) =2465a(6) =2877a(7) =7305a(8) =10585a(9) =15841a(10) =31021a(11) =31621a(12) =32041a(13) =41041a(14) =46657a(15) =52633a(16) =54145a(17) =75361a(18) =83333a(19) =115921a(20) =126217a(21) =162401a(22) =172081a(23) =211141a(24) =282133a(25) =284649a(26) =294409a(27) =334153a(28) =383161a(29) =399001