Cardano Triplets (noch nicht übersetzt)

Problem 251

A triplet of positive integers (a,b,c) is called a Cardano Triplet if it satisfies the condition:

3a+bc+3abc=1

For example, (2,1,5) is a Cardano Triplet.

There exist 149 Cardano Triplets for which a+b+c ≤ 1000.

Find how many Cardano Triplets exist such that a+b+c ≤ 110,000,000.