Primes in A087316 a(n) = Sum_{k=1..n} prime(k)^prime(n-k+1). a(2) = 17, a(12) = 283453407513524913023 A087316 INTERSECTIOBN A000040. Worth adding as a comment to A087316, even though it falls short of sufficient interest to stand on its own as a seq? And what are the next such primes? Best, Jonathan Vos Post