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.

A119198 Triangular numbers composed of digits {3,6,9}.

Original entry on oeis.org

3, 6, 36, 66, 666, 333336, 936396, 963966, 3966336, 3996939936, 99363693366, 63666996693966, 339666999336666, 633636693339936, 39696699699366996, 999699963339963966, 36936333639936696636, 6933666366666339963969663666, 393996396333933393393669696696, 399693363966633933999339639336
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A053949, A119199. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119199(n)). - Tyler Busby, Mar 26 2023

Extensions

a(19)-a(20) from Tyler Busby, Mar 26 2023

A053948 Numbers k such that k^2 contains only digits {3,6,9}.

Original entry on oeis.org

3, 6, 63, 264, 306, 1914, 3114, 31086, 81813, 190614, 251787, 310956, 184372811544, 631933060806, 3152295978114, 629836198308687, 2576231033241456, 18430047920827535573187, 31047286456844613647179386
Offset: 1

Views

Author

Patrick De Geest, Mar 15 2000

Keywords

Links

Crossrefs

Cf. A053949.

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005
One more term from Jon E. Schoenfield, Sep 04 2006
Three more terms from Mishima's webpage added by Max Alekseyev, Jun 17 2011
One more term from Zhao Hui Du, Mar 01 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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