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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.

A035071 a(n) = ceiling(sqrt(4*10^n)).

Table of values

n a(n)
0 2
1 7
2 20
3 64
4 200
5 633
6 2000
7 6325
8 20000
9 63246
10 200000
11 632456
12 2000000
13 6324556
14 20000000
15 63245554
16 200000000
17 632455533
18 2000000000
19 6324555321
20 20000000000
21 63245553204
22 200000000000
23 632455532034
24 2000000000000

List of values

[2, 7, 20, 64, 200, 633, 2000, 6325, 20000, 63246, 200000, 632456, 2000000, 6324556, 20000000, 63245554, 200000000, 632455533, 2000000000, 6324555321, 20000000000, 63245553204, 200000000000, 632455532034, 2000000000000]

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

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