a(n) = smallest prime which divides Pell(n) = A000129(n) but does not divide any Pell(k) for k<n, or -1 if no such prime exists.

A246556

a(n) = smallest prime which divides Pell(n) = A000129(n) but does not divide any Pell(k) for k<n, or -1 if no such prime exists.

Terms

    a(0) =2a(1) =5a(2) =3a(3) =29a(4) =7a(5) =13a(6) =17a(7) =197a(8) =41a(9) =5741a(10) =11a(11) =33461a(12) =239a(13) =269a(14) =577a(15) =137a(16) =199a(17) =37a(18) =19a(19) =45697a(20) =23a(21) =229a(22) =1153a(23) =1549a(24) =79a(25) =53a(26) =113a(27) =44560482149a(28) =31a(29) =61

External references