Majority of the integers from 1 to 100 can be evaluated using three 4's, +, -, *, /, ^, sqrt, decimal point, dot above a number, and !,!!,...? (both as factorials, multifactorials and subfactorials).

Clearly, both concatenation and brackets are allowed.

Let's try to minimize the set of "not achievable" numbers.

Team work to include all possible answers is encouraged.

(In reply to computer solutions (spoilers) by Charlie)

Nice indeed!

Posted by Ady TZIDON on 2017-12-07 02:15:37