The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A249717

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The smallest prime whose square divides the first nonsquarefree number on row n of Pascal's triangle, 1 if all terms on that row are squarefree.
(history; published version)

#6 by N. J. A. Sloane at Wed Nov 05 11:22:12 EST 2014

STATUS

proposed

approved

#5 by Antti Karttunen at Wed Nov 05 08:12:58 EST 2014

STATUS

editing

proposed

#4 by Antti Karttunen at Wed Nov 05 07:59:29 EST 2014

COMMENTS

All such n , for which a(n) < 3 , form a subsequence of A249724.

#3 by Antti Karttunen at Wed Nov 05 07:53:01 EST 2014

COMMENTS

All n for which a(n) < 3 form a subsequence of A249724.

CROSSREFS

Cf. A249716, A249739, A249724.

#2 by Antti Karttunen at Tue Nov 04 10:44:11 EST 2014

NAME

allocated for Antti KarttunenThe smallest prime whose square divides the first nonsquarefree number on row n of Pascal's triangle, 1 if all terms on that row are squarefree.

DATA

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, 2, 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, 2, 2, 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, 2, 5, 2, 5, 2, 2, 2, 5, 2, 3, 2, 3, 2, 2, 2, 2, 2, 3, 3, 3, 2

OFFSET

0,5

FORMULA

a(n) = A249739(A249716(n)).

PROG

(Scheme) (define (A249717 n) (A249739 (A249716 n)))

CROSSREFS

Cf. A249716, A249739.

Differs from A249718 for the first time at n=36, where a(36) = 2, while A249718(36) = 3.

KEYWORD

allocated

nonn

AUTHOR

Antti Karttunen, Nov 04 2014

STATUS

approved

editing

#1 by Antti Karttunen at Tue Nov 04 07:33:24 EST 2014

NAME

allocated for Antti Karttunen

KEYWORD

allocated

STATUS

approved