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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A354074 Factorials that are the sum of the divisors of some m.

Original entry on oeis.org

1, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 39916800, 479001600, 6227020800, 87178291200, 1307674368000, 20922789888000, 355687428096000, 6402373705728000, 121645100408832000, 2432902008176640000, 51090942171709440000, 1124000727777607680000
Offset: 1

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Author

Jaroslav Krizek, May 16 2022

Keywords

Comments

Sequence of different values of A000203(A245015(n)).
Conjecture: number 2 is the only factorial that is not in this sequence.

Examples

			Number 24 is in the sequence because sigma(14) = sigma(15) = sigma(23) = 24.

Crossrefs

Intersection of A000142 and A002191.
Cf. A000203, A338112, A055486, A055488, A245015, A354072, A354073, A338112.

Extensions

More terms from Jinyuan Wang, May 17 2022
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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