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.

A225649 Positions of non-ones in A225650, numbers n such that n and A000793(n) have at least one common divisor > 1.

Original entry on oeis.org

2, 3, 4, 6, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92
Offset: 1

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Author

Antti Karttunen, May 13 2013

Keywords

Comments

Which composites are missing apart from 8, 9 and 27? See comment at A225648.

Crossrefs

Cf. A225648 (complement), A225651 (from n>1 onward is a subset).