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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.

A101641 Positive integers n for which n = f(n), where f(n) is the total number of 4's required when writing out all numbers between 0 and n.

Table of values

n a(n)
1 499999984
2 499999985
3 499999986
4 499999987
5 499999988
6 499999989
7 499999990
8 499999991
9 499999992
10 499999993
11 500000000
12 10000000000
13 10499999984
14 10499999985
15 10499999986
16 10499999987
17 10499999988
18 10499999989

List of values

[499999984, 499999985, 499999986, 499999987, 499999988, 499999989, 499999990, 499999991, 499999992, 499999993, 500000000, 10000000000, 10499999984, 10499999985, 10499999986, 10499999987, 10499999988, 10499999989]

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

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