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.

A119057 Triangular numbers composed of digits {0,2,9}.

Original entry on oeis.org

990, 2090209222020090, 92209290022092090, 200290202090990220, 222020200990922029290
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

a(6) > 10^40. - Tyler Busby, Mar 28 2023

Links

Crossrefs

Cf. A000217, A058428, A119058. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119058(n)). - Michel Marcus, Mar 27 2023

A058427 Numbers k such that k^2 contains only digits {0,2,9}, not ending with zero.

Original entry on oeis.org

3, 47, 173, 547, 1703, 538703, 1731828227423, 94916921673747, 96385117673990673, 151400161921673747, 149067065510873088673
Offset: 1

Views

Author

Patrick De Geest, Nov 15 2000

Keywords

Links

Crossrefs

Cf. A058428.

Extensions

a(10) from Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 30 2008
a(11) from Mishima's website added by Elmo R. Oliveira, Jul 16 2025
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.