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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.

A201632 If the sum of the squares of 4 consecutive numbers is a triangular number t(u), then a(n) is its index u.

Table of values

n a(n)
1 35
2 83
3 1203
4 2835
5 40883
6 96323
7 1388835
8 3272163
9 47179523
10 111157235
11 1602714963
12 3776073843
13 54445129235
14 128275353443
15 1849531679043
16 4357585943235
17 62829631958243
18 148029646716563
19 2134357954901235
20 5028650402419923

List of values

[35, 83, 1203, 2835, 40883, 96323, 1388835, 3272163, 47179523, 111157235, 1602714963, 3776073843, 54445129235, 128275353443, 1849531679043, 4357585943235, 62829631958243, 148029646716563, 2134357954901235, 5028650402419923]

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

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