A249718 The largest prime whose square divides the first nonsquarefree number on row n of Pascal's triangle, 1 if all terms on that row are squarefree.

1, 1, 1, 1, 2, 1, 2, 1, 2, 3, 3, 1, 2, 3, 2, 3, 2, 2, 3, 3, 2, 3, 2, 1, 2, 5, 5, 3, 2, 3, 2, 3, 2, 2, 2, 2, 3, 3, 2, 3, 2, 2, 2, 3, 2, 3, 3, 3, 2, 7, 5, 5, 2, 5, 3, 3, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 5, 2, 5, 2, 3, 2, 3, 3, 3, 2, 3, 2, 3, 2, 2, 3, 3, 2, 3, 2, 3, 2, 2, 7, 3, 5, 5, 5, 5, 2, 2, 2, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 3, 3, 3, 2

Offset

0,5

Links

Table of n, a(n) for n=0..120.

Formula

a(n) = A249740(A249716(n)).

Prog

(Scheme) (define (A249718 n) (A249740 (A249716 n)))

Crossrefs

Cf. A249716, A249740.

Differs from A249717 for the first time at n=36, where a(36) = 3, while A249717(36) = 2.

Sequence in context: A035391 A242552 A249717 * A244518 A367251 A161310

Adjacent sequences: A249715 A249716 A249717 * A249719 A249720 A249721

Keyword

nonn

Author

Antti Karttunen, Nov 04 2014

Status

approved