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.

A303399 Number of ordered pairs (a, b) with 0 <= a <= b such that n - 5^a - 5^b can be written as the sum of two triangular numbers.

Table of values

n a(n)
1 0
2 1
3 1
4 1
5 1
6 2
7 1
8 2
9 2
10 2
11 2
12 3
13 3
14 2
15 2
16 2
17 3
18 2
19 2
20 2
21 2
22 3
23 2
24 2
25 1
26 4
27 3
28 3
29 2
30 5
31 4
32 4
33 4
34 3
35 3
36 4
37 4
38 3
39 4
40 4
41 4
42 3
43 2
44 4
45 3
46 3
47 3
48 5
49 2
50 4
51 5
52 4
53 4
54 4
55 4
56 3
57 5
58 3
59 4
60 4
61 4
62 4
63 4
64 3
65 3
66 5
67 4
68 5
69 3
70 3
71 5
72 5
73 2
74 4
75 6
76 3
77 3
78 4
79 4
80 3

List of values

[0, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 3, 3, 2, 2, 2, 3, 2, 2, 2, 2, 3, 2, 2, 1, 4, 3, 3, 2, 5, 4, 4, 4, 3, 3, 4, 4, 3, 4, 4, 4, 3, 2, 4, 3, 3, 3, 5, 2, 4, 5, 4, 4, 4, 4, 3, 5, 3, 4, 4, 4, 4, 4, 3, 3, 5, 4, 5, 3, 3, 5, 5, 2, 4, 6, 3, 3, 4, 4, 3]

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

Content is available under The OEIS End-User License Agreement.