Centered pentachoric number
A centered pentachoric number is a figurate number that represents a pentachoron.
The first such numbers are: 1, 6, 21, 56, 126, 251, 456, 771, 1231, 1876, 2751, 3906, 5396, 7281, … (sequence A008498 in the OEIS).
Centered pentachoric numbers can also be represented as the sum of the first n pentatope numbers.
Classes of natural numbers | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Powers and related numbers | |||||||||||||||||||||
| Of the form a × 2b ± 1 | |||||||||||||||||||||
| Other polynomial numbers | |||||||||||||||||||||
| Recursively defined numbers | |||||||||||||||||||||
| Possessing a specific set of other numbers | |||||||||||||||||||||
| Expressible via specific sums | |||||||||||||||||||||
| Generated via a sieve | |||||||||||||||||||||
| Code related | |||||||||||||||||||||
| Figurate numbers |
| ||||||||||||||||||||
| Pseudoprimes | |||||||||||||||||||||
| Combinatorial numbers | |||||||||||||||||||||
| Arithmetic functions |
| ||||||||||||||||||||
| Dividing a quotient | |||||||||||||||||||||
| Other prime factor or divisor related numbers | |||||||||||||||||||||
| Recreational mathematics | |||||||||||||||||||||
| |||||||||||||||||||||
This article is issued from
Wikipedia.
The text is licensed under Creative Commons - Attribution - Sharealike.
Additional terms may apply for the media files.