cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A249150 Number of trailing zeros in the factorial base representation of products of binomial coefficients: a(n) = A230403(A001142(n)).

Original entry on oeis.org

0, 0, 1, 0, 3, 1, 5, 0, 1, 3, 9, 6, 11, 5, 3, 0, 15, 1, 17, 3, 5, 9, 21, 10, 3, 11, 1, 5, 27, 24, 29, 0, 9, 15, 5, 35, 35, 17, 11, 39, 39, 5, 41, 9, 22, 21, 45, 18, 5, 3, 15, 11, 51, 1, 9, 34, 17, 27, 57, 46, 59, 29, 62, 0, 11, 9, 65, 15, 21, 48, 69, 40, 71, 35, 3, 17, 9, 11, 77, 79, 1
Offset: 0

Views

Author

Antti Karttunen, Oct 25 2014

Keywords

Comments

a(n) = A249151(n)-1. Please see the comments and graph of that sequence.

Crossrefs

One less than A249151.
Cf. A249423 (values k such that a(k) = k).
Cf. A249425 (record positions).
Cf. A249426 (record values).
Cf. A001142, A187059, A230403.

Programs

Formula

a(n) = A230403(A001142(n)).

A249423 Integers n such that A249150(n) = n; integers n such that A249151(n) = n+1.

Original entry on oeis.org

0, 35, 39, 62, 79, 83, 89, 104, 107, 131, 143, 149, 153, 159, 164, 167, 175, 179, 181, 194, 197, 199, 207, 209, 219, 259, 263, 269, 272, 274, 279, 285, 287, 296, 299, 305, 307, 311, 314, 319, 329, 339, 356, 359, 363, 373, 377, 379, 384, 389, 391, 395, 399, 407, 415, 417, 419, 424, 428, 431, 441, 449, 455, 461, 467, 475, 489, 512
Offset: 1

Views

Author

Antti Karttunen, Oct 28 2014

Keywords

Comments

Integers n such that {product of elements on row n of Pascal's triangle} is divisible by (n+1)! but not by (n+2)!

Links

Crossrefs

Subsequence of A249434 and of A249429; it differs from the latter for the first time at n=17, where a(17) = 175 > 174 = A249429(17).
Cf. A000142, A001142, A007318, A249150, A249151, A249424, A249425, A249426.

A249427 Record values in A249151.

Original entry on oeis.org

1, 2, 4, 6, 10, 12, 16, 18, 22, 28, 30, 36, 40, 42, 46, 52, 58, 60, 63, 66, 70, 72, 78, 80, 82, 84, 88, 90, 96, 100, 102, 105, 106, 108, 112, 119, 126, 130, 132, 136, 138, 144, 148, 150, 154, 156, 160, 162, 165, 166, 168, 172, 178, 180, 182, 190, 192, 195, 196, 198, 200, 208, 210, 220, 222, 226, 228, 232, 238, 240, 250, 256
Offset: 1

Views

Author

Antti Karttunen, Oct 28 2014

Keywords

Links

Crossrefs

One more than A249426.
Cf. A249151, A249425.
Differs from A006093 for the first at n=19, where a(19) = 63, while A006093(19) = 66.

Programs

Formula

a(n) = A249151(A249425(n)).
a(n) = A249426(n) + 1.
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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