A240554 Square array of the greatest prime factor of n^k + 1, read by antidiagonals.

1, 2, 1, 3, 2, 1, 2, 5, 2, 1, 5, 5, 3, 2, 1, 3, 17, 7, 17, 2, 1, 7, 13, 13, 41, 11, 2, 1, 2, 37, 7, 257, 61, 13, 2, 1, 3, 5, 31, 313, 41, 73, 43, 2, 1, 5, 13, 43, 1297, 521, 241, 547, 257, 2, 1, 11, 41, 19, 1201, 101, 601, 113, 193, 19, 2, 1, 3, 101, 73, 241

Offset: 1

Author

T. D. Noe, Apr 07 2014

Keywords

• nonn
• tabl

Links

• T. D. Noe, Rows n = 1..60 of triangle, flattened

Crossrefs

Cf. A003992 (n^k), A014442 (k=2), A081256 (k=3), A096172 (k=4).

Cf. A240548-A240553 (k=5 to 10).

Programs

Mathematica

Table[FactorInteger[(n-k)^k + 1][[-1,1]], {n, 12}, {k, n}]