Prime factors occurring in the norms given in S000949.

2, 3, 5, 13, 37, 41, 53, 61, 113, 157

1

Except for 2 and 3, these are all of the form 4k+1. If S000949 is extended, other prime factors may appear.

T. D. Noe, Plot of 10 terms

(Mma) (* let tn contain the numbers in S000949 *) Union[Flatten[Table[Transpose[FactorInteger[n]][[1]], {n, tn}]]]

Cf. S000949.

nonn,more

T. D. Noe, Oct 06 2016