In the first set you'll notice no doubt six consecutive primes 5, 7, 11, 13, 17 and 19.
All the members of the first two sets are semiprimes i.e. having exactly two distinct factors.
The third set has a common prime divisor > 2 to all members namely 179.
Curious is also the loop taken counterclockwise of the middle digits
of the factors of the second set starting from 443.
It starts with a 4, then a 5, then a ... up to and then finally a 9 in factor 397.
373 * 467 383 * 457 397 * 443
Common prime divisor of the members of the composite triplet
(298687992, 298688708, 298689424) which are in a bidirectional
'sum of prime factors' (i.e., 716) progression/retrogression.
Some OEIS entries
A050780  (n + sopf_n = m) and (m  sopf_m = n). Sequence gives values of n.
A050781  (n + sopf_n = m) and (m  sopf_m = n). Sequence gives values of m.
A057874  Sets of three composites in bidirectional 'sum of prime factors' progression/retrogression.
