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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.

A379567 Number of n-digit numbers that have exactly 4 divisors.

Original entry on oeis.org

2, 30, 260, 2316, 20719, 186565, 1694033, 15522194, 143359184, 1332981873, 12466196499, 117165976234, 1105961883514, 10478813824875, 99613913708218, 949727471728542
Offset: 1

Views

Author

Seiichi Manyama, Dec 26 2024

Keywords

Crossrefs

Column k=4 of A284398.
Cf. A035533.

Formula

a(n) = A035533(n) - A035533(n-1) for n > 2.

Extensions

a(10)-a(16) from Seiichi Manyama using A035533 data, Dec 26 2024

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

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