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.

A181610 The last n digits of powers of 2 start cycling. a(n) is the number of zero-free terms in this cycle.

Table of values

n a(n)
1 4
2 18
3 81
4 364
5 1638
6 7371
7 33170
8 149268
9 671701
10 3022653
11 13601945
12 61208743
13 275439346
14 1239477074
15 5577646830
16 25099410745
17 112947348510
18 508263067945
19 2287183805359
20 10292327123878
21 46315472056678
22 208419624257654
23 937888309161430
24 4220497391215744

List of values

[4, 18, 81, 364, 1638, 7371, 33170, 149268, 671701, 3022653, 13601945, 61208743, 275439346, 1239477074, 5577646830, 25099410745, 112947348510, 508263067945, 2287183805359, 10292327123878, 46315472056678, 208419624257654, 937888309161430, 4220497391215744]

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

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