Index of prime(n) in A353709, or -1 if prime(n) does not appear in A353709.

Terms

a(0) =2a(1) =5a(2) =13a(3) =53a(4) =56a(5) =34a(6) =9a(7) =69a(8) =86a(9) =185a(10) =245a(11) =50a(12) =102a(13) =105a(14) =549a(15) =83a(16) =692a(17) =1209a(18) =114a(19) =329a(20) =99a(21) =1007a(22) =189a(23) =235a(24) =47a(25) =319a(26) =542a(27) =740a(28) =724a(29) =232