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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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A363458 Numbers k such that k and k+1 are both in A363457.

Original entry on oeis.org

1, 54, 242883, 246962, 261643, 266001, 353893, 380287, 425818, 457055, 542950, 581942, 595440, 831264, 917311, 980235, 1256341, 1719654, 6239931, 8237549, 8378312, 10995744, 11650985, 15123420, 15194370, 15442721, 19628056, 20034738, 20308106, 26218271, 36099782
Offset: 1

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Author

Amiram Eldar, Jun 03 2023

Keywords

Comments

Numbers k such that A025487(k) and A025487(k+1) are both products of distinct primorial numbers (A002110), i.e., both terms of A129912.
The corresponding values of A025487(k) are 1, 2310, 22841771267013565192326000, 26648733144849159391047000, ..., and the corresponding values of A025487(k+1) are 2, 2520, 22842063073200641551281000, 26649458453137387177510200, ... .

Examples

			54 is a term since A025487(54) = 2310 and A025487(55) = 2520 are both products of distinct primorial numbers: 2310 = 2 * 3 * 5 * 7 * 11 and 2520 = 2 * (2 * 3) * (2 * 3 * 5 * 7).

Crossrefs

Cf. A002110, A025487, A129912, A363457.
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