A240554 - OEIS

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A240554

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

1

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

(list; table; graph; refs; listen; history; text; internal format)

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