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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.

A350570 a(n) is the smallest multiple of 7 that can be formed by concatenating the first n positive integers in some order.

Table of values

n a(n)
2 21
3 231
4 3241
5 12453
6 123564
7 1234576
8 12347685
9 123456879
10 10123456798
11 1011123456798
12 101111223456789
13 10111121323457896
14 1011112131423457896
15 101111213141523456879
16 10111121314151623456789
17 1011112131415161723456789
18 101111213141516171823458796

List of values

[21, 231, 3241, 12453, 123564, 1234576, 12347685, 123456879, 10123456798, 1011123456798, 101111223456789, 10111121323457896, 1011112131423457896, 101111213141523456879, 10111121314151623456789, 1011112131415161723456789, 101111213141516171823458796]

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

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