https://tiermaker.com/create/sums-of-single-digit-numbers-2-9-17317796
Sums with 0 or 1, or which are commutative forms of other sums are not included.
https://tiermaker.com/create/sums-of-single-digit-numbers-2-9-17317796
Sums with 0 or 1, or which are commutative forms of other sums are not included.
I dunno, having two primes sum to a power of two is undeniably powerful in my experience. The number of times a calculation goes from tedious to trivial from this sum is incalculable. The lowest I’d put it is A.