Primes of the form k^4-k-1.

Terms

a(0) =13a(1) =251a(2) =619a(3) =1289a(4) =2393a(5) =6551a(6) =14629a(7) =28547a(8) =65519a(9) =159979a(10) =279817a(11) =456949a(12) =2313401a(13) =2559959a(14) =3111653a(15) =3748051a(16) =6249949a(17) =7890427a(18) =9150569a(19) =10555943a(20) =12959939a(21) =13845779a(22) =21381307a(23) =25411609a(24) =35152963a(25) =38950001a(26) =45212093