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

Full prime factorization: [[5]] * [[7]] * [[11]]

Factor pairs:

[[385]] = [[5]] * [[77]]

[[385]] = [[7]] * [[55]]

[[385]] = [[11]] * [[35]]

Proper divisors: [[5]], [[7]], [[11]], [[35]], [[55]], [[77]]

Primes up to 385: [[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]], [[131]], [[137]], [[139]], [[149]], [[151]], [[157]], [[163]], [[167]], [[173]], [[179]], [[181]], [[191]], [[193]], [[197]], [[199]], [[211]], [[223]], [[227]], [[229]], … (76 total).

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

The closest centered hexagonal numbers are [[331]] (index #[[11]]) and [[397]] (index #[[12]]).

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]]: 148225

• [[square root]]: 19.6214

• [[cube]]: 57066625

• [[cube root]]: 7.2748

• [[natural log]] (ln): 5.9532

• [[base-10 log]] (log10): 2.5855

• [[base-2 log]] (log2): 8.5887