Primes of the form n*phi(n)-1 where phi is the Euler function (in order of appearance).

Terms

a(0) =5a(1) =7a(2) =19a(3) =11a(4) =41a(5) =31a(6) =53a(7) =109a(8) =47a(9) =83a(10) =127a(11) =271a(12) =107a(13) =251a(14) =191a(15) =499a(16) =311a(17) =811a(18) =239a(19) =929a(20) =659a(21) =839a(22) =431a(23) =683a(24) =503a(25) =2161a(26) =971a(27) =3659a(28) =2267a(29) =3119