66
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[[66]] is not prime (composite). Want proof? :)
Full prime factorization: [[2]] * [[3]] * [[11]]
Factor pairs:
Proper divisors: [[2]], [[3]], [[6]], [[11]], [[22]], [[33]]
Primes up to 66: [[2]], [[3]], [[5]], [[7]], [[11]], [[13]], [[17]], [[19]], [[23]], [[29]], [[31]], [[37]], [[41]], [[43]], [[47]], [[53]], [[59]], [[61]].
[[66]] is not a centered hexagonal number.
The closest centered hexagonal numbers are [[61]] (index # [[5]]) and [[91]] (index # [[6]]).
First 20 centered hexagonal numbers: [[1]], [[7]], [[19]], [[37]], [[61]], [[91]], [[127]], [[169]], [[217]], [[271]], [[331]], [[397]], [[469]], [[547]], [[631]], [[721]], [[817]], [[919]], [[1027]], [[1141]].
[[square]]: 4356
[[square root]]: 8.1240
[[cube]]: 287496
[[cube root]]: 4.0412
[[natural log]] (ln): 4.1897
[[base-10 log]] (log10): 1.8195
[[base-2 log]] (log2): 6.0444
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