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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.

A116209 Numbers k such that k concatenated with k+7 gives the product of two numbers which differ by 7.

Table of values

n a(n)
1 1
2 13
3 41
4 653
5 2287
6 2723
7 5491
8 23240971
9 26823191
10 60249661
11 1841968537
12 2009317771
13 3044234903
14 3258336353
15 8166731261
16 9481619237
17 1281071245505271100098621541
18 1551605670846640136726379653

List of values

[1, 13, 41, 653, 2287, 2723, 5491, 23240971, 26823191, 60249661, 1841968537, 2009317771, 3044234903, 3258336353, 8166731261, 9481619237, 1281071245505271100098621541, 1551605670846640136726379653]

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

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