Primes of the form a^a + a*b + b^b.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =23a(5) =31a(6) =37a(7) =251a(8) =257a(9) =3119a(10) =3167a(11) =46649a(12) =46663a(13) =49811a(14) =823591a(15) =870241a(16) =16780381a(17) =387420479a(18) =387420499a(19) =285311717333