[[16]] is not prime (composite). Want proof? :)

Full prime factorization: [[2]] * [[2]] * [[2]] * [[2]]

Factor pairs:

[[16]] = [[2]] * [[8]]

[[16]] = [[4]] * [[4]]

Proper divisors: [[2]], [[4]], [[8]]

Primes up to 16: [[2]], [[3]], [[5]], [[7]], [[11]], [[13]].

[[16]] is not a centered hexagonal number.

The closest centered hexagonal numbers are [[7]] (index # [[2]]) and [[19]] (index # [[3]]).

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]].

[[hz/16]] is closest to [[C0]] at [[16]] Hz (-38 cents).

Note class: [[C]], Octave: [[octave/0]].

• [[square]]: 256

• [[square root]]: 4.0000

• [[cube]]: 4096

• [[cube root]]: 2.5198

• [[natural log]] (ln): 2.7726

• [[base-10 log]] (log10): 1.2041

• [[base-2 log]] (log2): 4.0000