Minimal m such that n^n-m and n^n+m are both primes, or -1 if there is no such m.

Terms

a(0) =1a(1) =4a(2) =15a(3) =42a(4) =7a(5) =186a(6) =75a(7) =10a(8) =33a(9) =1302a(10) =487a(11) =114a(12) =297a(13) =58a(14) =2253a(15) =1980a(16) =1045a(17) =1638a(18) =1767a(19) =2032a(20) =8067a(21) =10800a(22) =257a(23) =588a(24) =3423a(25) =3334a(26) =5907a(27) =12882a(28) =1213a(29) =12972