Partial sums of the Fermat pseudoprimes to base 2, A001567.

Terms

a(0) =341a(1) =902a(2) =1547a(3) =2652a(4) =4039a(5) =5768a(6) =7673a(7) =9720a(8) =12185a(9) =14886a(10) =17707a(11) =20984a(12) =25017a(13) =29386a(14) =33757a(15) =38438a(16) =43899a(17) =50500a(18) =58457a(19) =66778a(20) =75259a(21) =84170a(22) =94431a(23) =105016a(24) =116321a(25) =129122a(26) =142863a(27) =156610a(28) =170591a(29) =185082