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).
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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