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.

A224475 (2*5^(2^n) + (10^n)/2 - 1) mod 10^n: a sequence of trimorphic numbers ending (for n > 1) in 9.

Table of values

n a(n)
1 4
2 99
3 749
4 6249
5 31249
6 281249
7 781249
8 75781249
9 925781249
10 1425781249
11 86425781249
12 336425781249
13 4836425781249
14 69836425781249
15 19836425781249
16 7519836425781249
17 62519836425781249
18 12519836425781249
19 9512519836425781249
20 34512519836425781249

List of values

[4, 99, 749, 6249, 31249, 281249, 781249, 75781249, 925781249, 1425781249, 86425781249, 336425781249, 4836425781249, 69836425781249, 19836425781249, 7519836425781249, 62519836425781249, 12519836425781249, 9512519836425781249, 34512519836425781249]

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

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