cp's OEIS Frontend

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.

A263920 A positive integer n is in this sequence iff arctan(n)^2 can be represented as Sum_{0 c(k)*arctan(k)^2 with rational c(k). The terms are in increasing order.

Table of values

n a(n)
1 7
2 47
3 57
4 99
5 117

List of values

[7, 47, 57, 99, 117]

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

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