Problems & Puzzles:
pq+rs, perfect square.
In one of the the Prime Curios!
pages from Caldwell & Honaker, Jr. I found this curio:
Let p < q < r < s be consecutive primes.
The least prime p for
which pq + rs is a perfect square is 203233.
Q1 Find three more cases.
BTW see our
Contributions came from Ryan Bailey & Emmanuel Vantieghem
Both weren't able to find more solutions than the reported one going up to
21940132061 and to 31*10^9, in their respectively search.