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.

A119071 Triangular numbers composed of digits {0,4,5}.

Original entry on oeis.org

45, 55, 4005, 5050, 404550, 405450, 500500, 40405555, 40504500, 50005000, 454044045, 500054500, 4050045000, 4540044405, 5000050000, 405000450000, 455005054540, 500000500000, 40500004500000, 50000005000000, 50450455004040, 540550504445050, 4050000045000000
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A058436, A119072. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119072(n)). - Michel Marcus, Mar 15 2023

Extensions

a(21)-a(23) from Tyler Busby, Mar 14 2023

A058435 Numbers k such that k^2 contains only digits {0,4,5}, not ending with zero.

Original entry on oeis.org

2, 224612, 233462, 7376002, 21072602, 22370752, 7386136002, 735156748252, 21082112192576920612, 63639964217112858462, 6674983479713230005962, 21214250022106461574572502, 2108436491907081488939581538
Offset: 1

Views

Author

Patrick De Geest, Nov 15 2000

Keywords

Links

Crossrefs

Cf. A058436.

Extensions

Three more terms from Mishima's webpage added by Max Alekseyev, Jan 28 2012
a(12) from Zhao Hui Du, Feb 28 2024
a(13) from Zhao Hui Du, Mar 08 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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