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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.

A279821 Composite numbers m with sqrt(m) not prime such that T(m) == 1 (mod m), where the central trinomial coefficient T(m) is the coefficient of x^m in the expansion of (x^2+x+1)^m.

Table of values

n a(n)
1 12
2 30
3 902
4 1360
5 2450
6 3730
7 21475
8 74945
9 82208
10 88282
11 254677

List of values

[12, 30, 902, 1360, 2450, 3730, 21475, 74945, 82208, 88282, 254677]

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

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