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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.

A337079 The number of twin binary Niven numbers (k, k+1) such that k <= 2^n.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 2
6 2
7 5
8 8
9 18
10 35
11 61
12 98
13 187
14 304
15 492
16 880
17 1583
18 2779
19 5196
20 9407
21 17387
22 31772
23 58450
24 106360
25 193875
26 351836
27 642844
28 1173333
29 2155913
30 3993379
31 7466547
32 14048253
33 26680668
34 50751057
35 97052665
36 185557893
37 354235368
38 674995568
39 1284856970

List of values

[1, 1, 1, 1, 2, 2, 5, 8, 18, 35, 61, 98, 187, 304, 492, 880, 1583, 2779, 5196, 9407, 17387, 31772, 58450, 106360, 193875, 351836, 642844, 1173333, 2155913, 3993379, 7466547, 14048253, 26680668, 50751057, 97052665, 185557893, 354235368, 674995568, 1284856970]

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

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