Centered pentachoric number
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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 OEIS).
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Classes of natural numbers
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| Powers and related numbers |
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| Of the form a × 2b ± 1 |
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| Other polynomial numbers |
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| Recursively defined numbers |
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| Possessing a specific set of other numbers |
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| Expressible via specific sums |
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| Generated via a sieve |
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| Code related | |||||||||||||||||||||
| Figurate numbers |
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| Pseudoprimes | |||||||||||||||||||||
| Combinatorial numbers |
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| Arithmetic functions |
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| Dividing a quotient | |||||||||||||||||||||
| Other prime factor or divisor related numbers |
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| Recreational mathematics |
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