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.

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A367010 a(n) is the sum of the divisors of n*2^n + 1.

Original entry on oeis.org

1, 4, 13, 31, 84, 192, 576, 1344, 2736, 5040, 13680, 24276, 56000, 153842, 308416, 538920, 1110276, 2909040, 5495040, 14446080, 31374720, 45955008, 106119552, 233997312, 527587200, 1184932800, 3247522560, 4365239040, 7784309910, 16265125632, 36250560000
Offset: 0

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Author

Sean A. Irvine, Oct 31 2023

Keywords

Comments

The numbers n*2^n+1 are called Cullen numbers.

Crossrefs

Programs

Formula

a(n) = sigma(n*2^n + 1) = A000203(A002064(n)).
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