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.

A029521 Numbers k such that k divides the (left) concatenation of all numbers <= k written in base 4 (most significant digit on right and removing all least significant zeros before concatenation).

Table of values

n a(n)
1 1
2 3
3 15
4 969
5 1107
6 136193
7 538019
8 2177475
9 2799315
10 5948555

List of values

[1, 3, 15, 969, 1107, 136193, 538019, 2177475, 2799315, 5948555]

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

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