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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.

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A382930 a(n) is the smallest k such that A382506(k) + sigma(k) = A000396(n).

Original entry on oeis.org

1, 4, 16, 180, 2520, 7207200
Offset: 1

Views

Author

Leo Hennig, Apr 09 2025

Keywords

Comments

Numbers k for which A382506 "jumps", there appears to be a remarkable relationship to A002182, the highly composites, in line with jumps for A382483 being in that series. See also the graph for A382506.

Examples

			A382506(16) = 465, 465 + sigma(16) = 496, which is perfect.

Crossrefs

Cf. A002093, A002182, A382506.

Extensions

New name and a(1) from Jinyuan Wang, Apr 10 2025
a(6) from David A. Corneth, Apr 10 2025
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