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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.

A221205 a(n) is the nearest integer to sqrt(pi(10^n)) (see A006880).

Table of values

n a(n)
0 0
1 2
2 5
3 13
4 35
5 98
6 280
7 815
8 2400
9 7131
10 21332
11 64172
12 193928
13 588273
14 1790235
15 5463018
16 16710426
17 51220671
18 157289397
19 483795067
20 1490241458
21 4596440959
22 14193917243
23 43878472986
24 135777758736
25 420530985064
26 1303551591182
27 4043817556078
28 12553456467283
29 38996129419652

List of values

[0, 2, 5, 13, 35, 98, 280, 815, 2400, 7131, 21332, 64172, 193928, 588273, 1790235, 5463018, 16710426, 51220671, 157289397, 483795067, 1490241458, 4596440959, 14193917243, 43878472986, 135777758736, 420530985064, 1303551591182, 4043817556078, 12553456467283, 38996129419652]

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

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