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.

A119204 Triangular numbers composed of digits {4,5,7}.

Original entry on oeis.org

45, 55, 5747745, 744574755, 77545447574475, 4745745457757444544544575, 44477447457545755547775754555, 547457575775574544754447747777455
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

a(8) > 10^40. - Tyler Busby, Mar 28 2023

Links

Crossrefs

Cf. A000217, A053951, A119205. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119205(n)). - Jon E. Schoenfield, Mar 27 2023

Extensions

a(8) from Tyler Busby, Mar 28 2023

A053950 Numbers k such that k^2 contains only digits {4,5,7}.

Original entry on oeis.org

2, 88, 6888, 6912, 7588, 68962, 6674412, 2749137588, 7466242412, 8629863583949388, 27341447393189418631675507588
Offset: 1

Views

Author

Patrick De Geest, Mar 15 2000

Keywords

Links

Crossrefs

Cf. A053951.

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
One more term from Mishima's webpage added by Max Alekseyev, Jan 28 2012
a(11) from Zhao Hui Du, Mar 09 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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