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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.

A264738 a(n) is least number > 0 such that the concatenation of a(1) ... a(n) is triangular (m*(m+1)/2).

Table of values

n a(n)
1 1
2 5
3 3
4 181
5 88028
6 21235051740
7 567915201450407862150
8 344114043575504570099838908555592732193828
9 2517587700386740093077985318903210991887701682095104296188806385635425261250603998340

List of values

[1, 5, 3, 181, 88028, 21235051740, 567915201450407862150, 344114043575504570099838908555592732193828, 2517587700386740093077985318903210991887701682095104296188806385635425261250603998340]

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

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