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.

A250296 Number n such that A057137(n) is a semiprime.

Original entry on oeis.org

3, 4, 7, 11, 17, 27, 31, 124, 157, 247
Offset: 1

Views

Author

Eric Chen, Dec 25 2014

Keywords

Comments

First unknown: 397.

Examples

			a(4) = 11 so A057137(11) = 12345678901 = 857 * 14405693 is a semiprime.

Crossrefs

Cf. A120819, A057137, A046461.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.