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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.

A204513 A204517(n)^2 = floor[A055859(n)/7]: Squares which written in base 7, with some digit appended, yield another square.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 9
6 36
7 289
8 2304
9 9216
10 73441
11 585225
12 2340900
13 18653761
14 148644864
15 594579456
16 4737981889
17 37755210249
18 151020840996
19 1203428746081
20 9589674758400
21 38358699033600
22 305666163522721
23 2435739633423369
24 9742958533693476
25 77638002106025089
26 618668277214777344
27 2474673108859109376
28 19719746868766849921
29 157139306672920022025
30 628557226691680088100
31 5008738066664673854881
32 39912765226644470817024
33 159651060906577883268096

List of values

[0, 0, 0, 1, 9, 36, 289, 2304, 9216, 73441, 585225, 2340900, 18653761, 148644864, 594579456, 4737981889, 37755210249, 151020840996, 1203428746081, 9589674758400, 38358699033600, 305666163522721, 2435739633423369, 9742958533693476, 77638002106025089, 618668277214777344, 2474673108859109376, 19719746868766849921, 157139306672920022025, 628557226691680088100, 5008738066664673854881, 39912765226644470817024, 159651060906577883268096]

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

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