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Knowledge Base
Number Sequences
- 16 What are Mersenne Primes?
- 17 What are Mersenne Exponents?
- 18 What are Perfect Numbers?
- 19 What are Superperfect Numbers?
- 20 What are Pseudoperfect Numbers?
- 21 What are Weird Numbers?
- 22 What are Sublime Numbers?
- 23 What is the Jacobsthal-Oblong Sequence?
- 24 What is the Bell Sequence?
- 25 What is the "Lychrel-Sequence"?
- 26 What are "permutable primes"?
- 27 What are "Happy Numbers"?
- 28 What are "Lucky Numbers"?
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