[[12]] is not prime (composite): [[2]] * [[2]] * [[3]]

Factor pairs: [[2]] * [[6]], [[3]] * [[4]]

Prime neighborhood: [[5]], [[7]], [[11]], [[12]], [[13]], [[17]], [[19]]

Prime gap: 2 (interval [[11]] to [[13]])

Special: lies between twin primes [[11]] and [[13]].

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

[[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