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

Full prime factorization: [[2]] * [[2]] * [[2]] * [[5]] * [[5]]

Factor pairs:

[[200]] = [[2]] * [[100]]

[[200]] = [[4]] * [[50]]

[[200]] = [[5]] * [[40]]

[[200]] = [[8]] * [[25]]

[[200]] = [[10]] * [[20]]

Proper divisors: [[2]], [[4]], [[5]], [[8]], [[10]], [[20]], [[25]], [[40]], [[50]], [[100]]

Primes up to 200: [[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]].

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

The closest centered hexagonal numbers are [[169]] (index #[[8]]) and [[217]] (index #[[9]]).

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]]: 40000

• [[square root]]: 14.1421

• [[cube]]: 8000000

• [[cube root]]: 5.8480

• [[natural log]] (ln): 5.2983

• [[base-10 log]] (log10): 2.3010

• [[base-2 log]] (log2): 7.6439