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.

A386643 Elimination order of the first person in a variation of the Josephus problem in which one person is skipped, then one is eliminated, then two people are skipped and one eliminated, then three people are skipped and so on.

Original entry on oeis.org

1, 2, 3, 2, 3, 4, 5, 3, 7, 9, 5, 7, 4, 10, 6, 13, 16, 18, 5, 17, 10, 22, 22, 8, 17, 6, 21, 15, 27, 18, 16, 18, 23, 7, 12, 35, 35, 36, 28, 13, 15, 37, 8, 21, 30, 16, 37, 26, 30, 41, 23, 19, 9, 28, 33, 13, 28, 44, 50, 35, 60, 58, 53, 10, 47, 61, 41, 37, 26, 34, 70, 15, 66, 34, 50, 11, 55, 19, 70, 70
Offset: 1

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Author

Tanya Khovanova, Nathan Sheffield, and the MIT PRIMES STEP junior group, Jul 27 2025

Keywords

Examples

			Consider 4 people in a circle. Initially, person number 1 is skipped, and person 2 is eliminated. The remaining people are now in order 3, 4, 1. Then, two people are skipped, and person 1 is eliminated, implying that the order of elimination of the first person is 2: a(4) = 2.
		

Crossrefs

The first column of triangle A386639.