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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.

A186261 a(n) = 9*b_9(n) + 8, where b_9 lists the indices of zeros of the sequence A261309: u(n) = abs(u(n-1) - gcd(u(n-1), 9n-1)), u(1) = 1.

Table of values

n a(n)
1 26
2 269
3 2699
4 26423
5 259829
6 2595473
7 25954289
8 259491059
9 2594910599
10 25949104721
11 259491047219
12 2594905133453
13 25949039883929
14 259490398799609
15 2594903521711517
16 25949035214699921
17 259490352146949701
18 2594903520789157301
19 25949035207891572929
20 259490352078915446897

List of values

[26, 269, 2699, 26423, 259829, 2595473, 25954289, 259491059, 2594910599, 25949104721, 259491047219, 2594905133453, 25949039883929, 259490398799609, 2594903521711517, 25949035214699921, 259490352146949701, 2594903520789157301, 25949035207891572929, 259490352078915446897]

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

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