Let N(p,i) denote the result of applying "nextprime" i times to p; a(n) = smallest prime p such that N(p,4) - p = 2*n, or -1 if no such prime exists.

A339944

Let N(p,i) denote the result of applying "nextprime" i times to p; a(n) = smallest prime p such that N(p,4) - p = 2*n, or -1 if no such prime exists.

Terms

    a(0) =-1a(1) =-1a(2) =-1a(3) =-1a(4) =3a(5) =5a(6) =17a(7) =13a(8) =19a(9) =47a(10) =79a(11) =73a(12) =113a(13) =109a(14) =193a(15) =317a(16) =313a(17) =521a(18) =503a(19) =523a(20) =887a(21) =1499a(22) =1231a(23) =1319a(24) =1373a(25) =1321a(26) =1307a(27) =3947a(28) =2473a(29) =2143

External references