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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.

A128952 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 the prime 3 and is not divisible by at least one of the primes 2, 5 and 7.

Table of values

n a(n)
2 66
3 657
4 6572
5 65715
6 657143
7 6571429
8 65714286
9 657142857
10 6571428572
11 65714285715
12 657142857143
13 6571428571429
14 65714285714286
15 657142857142857
16 6571428571428572
17 65714285714285715
18 657142857142857143
19 6571428571428571429
20 65714285714285714286
21 657142857142857142857

List of values

[66, 657, 6572, 65715, 657143, 6571429, 65714286, 657142857, 6571428572, 65714285715, 657142857143, 6571428571429, 65714285714286, 657142857142857, 6571428571428572, 65714285714285715, 657142857142857143, 6571428571428571429, 65714285714285714286, 657142857142857142857]

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

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