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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.

A128957 a(n) is equal to the number of positive integers m less than or equal to 10^n such that m is not divisible by at least one of the primes 2,5 and is not divisible by at least one of the primes 3,7.

Table of values

n a(n)
2 86
3 857
4 8571
5 85715
6 857142
7 8571429
8 85714286
9 857142857
10 8571428571
11 85714285715
12 857142857142
13 8571428571429
14 85714285714286
15 857142857142857
16 8571428571428571
17 85714285714285715
18 857142857142857142

List of values

[86, 857, 8571, 85715, 857142, 8571429, 85714286, 857142857, 8571428571, 85714285715, 857142857142, 8571428571429, 85714285714286, 857142857142857, 8571428571428571, 85714285714285715, 857142857142857142]

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

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