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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.

A371887 a(1) = 1; for n > 1, a(n) is the smallest positive integer k such that the digits of 2^k contain 2^a(n-1) as a proper substring.

Table of values

n	a(n)
1	1
2	5
3	15
4	507

List of values

[1, 5, 15, 507]

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

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