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.

A128951 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 5 and is not divisible by at least one of the primes 2, 3 and 7.

Table of values

n a(n)
2 78
3 781
4 7809
5 78096
6 780952
7 7809524
8 78095238
9 780952381
10 7809523809
11 78095238096
12 780952380952
13 7809523809524
14 78095238095238
15 780952380952381
16 7809523809523809
17 78095238095238096
18 780952380952380952

List of values

[78, 781, 7809, 78096, 780952, 7809524, 78095238, 780952381, 7809523809, 78095238096, 780952380952, 7809523809524, 78095238095238, 780952380952381, 7809523809523809, 78095238095238096, 780952380952380952]

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

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