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.

A317390 A(n,k) is the n-th positive integer that has exactly k representations of the form 1 + p1 * (1 + p2* ... * (1 + p_j)...), where [p1, ..., p_j] is a (possibly empty) list of distinct primes; square array A(n,k), n>=1, k>=0, read by antidiagonals.

Table of values

n a(n)
1 2
2 1
3 5
4 25
5 3
6 7
7 43
8 29
9 4
10 11
11 211
12 61
13 37
14 6
15 15
16 638
17 261
18 91
19 40
20 8
21 23
22 664
23 848
24 421
25 111
26 41
27 9
28 26
29 1613
30 1956
31 921
32 426
33 121
34 49
35 10
36 27
37 2991
38 3321
39 2058
40 969
41 441
42 124
43 51
44 12
45 28
46 7021
47 3004
48 3336
49 2092
50 1002
51 484
52 171
53 52
54 13
55 31
56 11306
57 7162
58 3319
59 3368
60 2094
61 1026
62 535
63 184
64 67
65 14
66 33

List of values

[2, 1, 5, 25, 3, 7, 43, 29, 4, 11, 211, 61, 37, 6, 15, 638, 261, 91, 40, 8, 23, 664, 848, 421, 111, 41, 9, 26, 1613, 1956, 921, 426, 121, 49, 10, 27, 2991, 3321, 2058, 969, 441, 124, 51, 12, 28, 7021, 3004, 3336, 2092, 1002, 484, 171, 52, 13, 31, 11306, 7162, 3319, 3368, 2094, 1026, 535, 184, 67, 14, 33]