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.

A172506 a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form (1)(2)(3)...(n-1)(n).(1)(2)(3)...(n-1)(n).

Table of values

n a(n)
1 11
2 303
3 123123
4 6170617
5 246902469
6 1929001929
7 12345671234567
8 617283906172839
9 123456789123456789
10 123456789101234567891
11 12345678910111234567891011
12 15432098637639015432098637639
13 1234567891011121312345678910111213
14 6172839455055606570617283945505560657

List of values

[11, 303, 123123, 6170617, 246902469, 1929001929, 12345671234567, 617283906172839, 123456789123456789, 123456789101234567891, 12345678910111234567891011, 15432098637639015432098637639, 1234567891011121312345678910111213, 6172839455055606570617283945505560657]

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

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