[[129]] is not prime (composite): [[3]] * [[43]]

Prime neighborhood: [[109]], [[113]], [[127]], [[129]], [[131]], [[137]], [[139]]

Prime gap: 4 (interval [[127]] to [[131]])

Primes up to 129: [[2]], [[3]], [[5]], [[7]], [[11]], [[13]], [[17]], [[19]], [[23]], [[29]], [[31]], [[37]], [[41]], [[43]], [[47]], [[53]], [[59]], [[61]], [[67]], [[71]], [[73]], [[79]], [[83]], [[89]], [[97]], [[101]], [[103]], [[107]], [[109]], [[113]], [[127]] (31 total).

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

The closest centered hexagonal numbers are [[127]] (index # [[7]]) and [[169]] (index # [[8]]).

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/129]] is closest to [[C3]] at [[129]] Hz (-24 cents).

Note class: [[C]], Octave: [[octave/3]].

• [[square]]: 16641

• [[square root]]: 11.3578

• [[cube]]: 2146689

• [[cube root]]: 5.0528

• [[natural log]] (ln): 4.8598

• [[base-10 log]] (log10): 2.1106

• [[base-2 log]] (log2): 7.0112