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.

A110790 Copies of 3 and 1 alternately such that every partial concatenation is a prime.

Original entry on oeis.org

3, 1, 3, 111111111111111, 33333, 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111, 3333, 111111111111111111111111111, 33333
Offset: 1

Views

Author

Amarnath Murthy, Aug 13 2005

Keywords

Comments

The next term has 168 digits. - Charles R Greathouse IV, Sep 29 2008

Examples

			3, 31, 313, 313111111111111111, ... are all prime.

Crossrefs

Cf. A110791 (digit lengths)
Other digits: A110774, A110776, A110778, A110780, A110782, A110788.

Extensions

a(6)-a(9) from_Charles R Greathouse IV_, Sep 29 2008

A110793 Number of digits in A110792(n).

Original entry on oeis.org

1, 1, 7, 9, 2, 65, 19, 20, 39, 54, 228, 231, 149, 630, 1641, 8794, 12907
Offset: 1

Views

Author

Amarnath Murthy, Aug 13 2005

Keywords

Crossrefs

Cf. A110774, A110775, A110776, A110777, A110778, A110780, A110781, A110782, A110783, A110788, A110789, A110790, A110791, A110792.

Extensions

a(6)-a(15) from Sean A. Irvine, Mar 22 2010
a(16) from Michael S. Branicky, Jun 23 2023
a(17) from Michael S. Branicky, Nov 19 2024
Showing 1-2 of 2 results.

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

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