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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A328226 Primitive elements of A278638.

Original entry on oeis.org

6, 15, 20, 21, 28, 33, 35, 44, 52, 55, 65, 68, 76, 77, 85, 91, 95, 115, 117, 119, 133, 143, 145, 153, 155, 161, 171, 184, 185, 187, 203, 205, 207, 209, 215, 217, 221, 232, 235, 247, 248, 253, 259, 261, 265, 279, 287, 296, 299, 301, 305, 319, 323, 328, 329, 333, 335, 341
Offset: 1

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Author

Max Alekseyev, Oct 08 2019

Keywords

Comments

A number k belongs to this sequence if k is a term of A278638, while its proper divisors are not. It follows that A278638 is formed by the multiples of the terms of this sequence.

Crossrefs

Cf. A000961, A001284, A072207, A278638.
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