Consider the number of lines in the Pratt certificate for the n-th prime (A037202). This sequence shows where 2n first occurs.

A244624

Consider the number of lines in the Pratt certificate for the n-th prime (A037202). This sequence shows where 2n first occurs.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =9a(4) =14a(5) =34a(6) =61a(7) =120a(8) =215a(9) =690a(10) =1144a(11) =2584a(12) =5626a(13) =13709a(14) =31275a(15) =63461a(16) =145767a(17) =340332a(18) =649190a(19) =1703684a(20) =4218462a(21) =10675070a(22) =22892978

External references