[ October 3, 2000 ]
I'd like to submit to the devoted number lovers the following rather hard puzzle
( catalogued as Sloane's A057874 ) in the hope of receiving the elusive th
set of three composites in bi-directional
'Sum Of Prime Factors' progression/retrogression.
A mouthful, I am aware! Hence this jolly table which will clarify the concept better than any words can.

Many more triplets have been found [ October, 2000 ]
by  Roberto Botrugno  from Italy... read on!

Click here to see how Roberto
managed to find these remarkably large solutions

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 semi-primes 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 bi-directional
'sum of prime factors' (i.e., 716) progression/retrogression.