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

Full prime factorization: [[2]] * [[2]] * [[3]]

Factor pairs:

[[12]] = [[2]] * [[6]]

[[12]] = [[3]] * [[4]]

Proper divisors: [[2]], [[3]], [[4]], [[6]]

Primes up to 12: [[2]], [[3]], [[5]], [[7]], [[11]].

[[12]] 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/12]] is closest to [[G-1]] at [[12]] Hz (-36 cents).

Note class: [[G]], Octave: [[octave/-1]].

• [[square]]: 144

• [[square root]]: 3.4641

• [[cube]]: 1728

• [[cube root]]: 2.2894

• [[natural log]] (ln): 2.4849

• [[base-10 log]] (log10): 1.0792

• [[base-2 log]] (log2): 3.5850