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

1,2

Links

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

Mathematica

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

Crossrefs

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

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

Sequence in context: A076081 A304089 A209281 * A107338 A118123 A181743

Adjacent sequences: A240551 A240552 A240553 * A240555 A240556 A240557

Keyword

nonn,tabl

Author

T. D. Noe, Apr 07 2014

Status

approved