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.

Showing 1-2 of 2 results.

A101019 Duplicate of A056266.

Original entry on oeis.org

5, 71, 95, 113, 203, 983, 1225
Offset: 1

Views

Author

Keywords

A082719 Numbers k such that (89*10^(k-1) + 1)/9 is a depression prime.

Original entry on oeis.org

7, 73, 97, 115, 205, 985, 1227, 4795, 20721, 133581, 411591
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.
No other terms below 700000. - Serge Batalov, Sep 22 2014

Examples

			k=7 -> (89*10^(7-1) + 1)/9 = 8*(10^7 - 1)/9 + (10^6 + 1) = 8888888 + 1000001 = 9888889.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A082697-A082719, A056266.

Extensions

Additional PRP term 133581 from Serge Batalov, May 15 2010
Additional PRP term 411591 from Serge Batalov, Sep 22 2014
Edited by Ray Chandler, Nov 05 2014
Definition revised by N. J. A. Sloane, Oct 30 2019
Showing 1-2 of 2 results.

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

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