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A249430
a(n) = Least integer k such that A249431(k) = n, and -1 if no such integer exists.
5
1, 0, 350, 439, 174, 713, 323, 1923, 1052, 999, 1766, 3749, 2254, 2253, 1934, 3391
OFFSET
0,3
COMMENTS
a(n) = the least natural number k such that {product of elements on row k of Pascal's triangle} is divisible by (k+n)! but not by (k+n+1)!
Note: a(18) = 3144 and a(24) = 2974. First values k for which A249431(k) = 16 and 17, if they exist, are larger than 4096.
PROG
(Scheme) (define (A249430 n) (let loop ((k 0)) (cond ((= n (A249431 k)) k) (else (loop (+ 1 k))))))
CROSSREFS
Nonnegative terms are all members of A249434.
Sequence in context: A285463 A138944 A043619 * A260763 A109761 A109762
KEYWORD
nonn,more
AUTHOR
Antti Karttunen, Nov 02 2014
STATUS
approved