53576

Appears in sequences

• Number of obtuse triangles on an n X n grid (or geoboard).at n=8A190020
• Bases b where exactly eight primes p with p < b exist such that p is a base-b Wieferich prime.at n=28A325884
• Smallest k such that in the pairs of numbers j*k +- 1, none is prime for 1 <= j < n but at least one is prime for j = n; or 0 if no such k exists.at n=20A348347