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.

A080387 Numbers k such that there are exactly 10 numbers j for which binomial(k, floor(k/2)) / binomial(k,j) is an integer, i.e., A080383(k) = 10.

Table of values

n a(n)
1 13
2 31
3 41
4 57
5 85
6 91
7 133
8 155
9 177
10 183
11 209
12 221
13 253
14 281
15 307
16 313
17 341
18 375
19 381
20 409
21 419
22 441
23 457
24 463
25 477
26 481
27 533
28 553
29 599
30 617
31 625
32 631
33 645
34 651
35 661
36 691
37 737
38 757
39 829
40 841
41 859
42 871
43 881
44 885
45 901
46 919
47 929
48 937
49 953
50 967
51 987
52 993

List of values

[13, 31, 41, 57, 85, 91, 133, 155, 177, 183, 209, 221, 253, 281, 307, 313, 341, 375, 381, 409, 419, 441, 457, 463, 477, 481, 533, 553, 599, 617, 625, 631, 645, 651, 661, 691, 737, 757, 829, 841, 859, 871, 881, 885, 901, 919, 929, 937, 953, 967, 987, 993]

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

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