-4373domain: ZAppears in sequencesPrimes or negative values of primes of the form 59*n^2 - 1873*n + 8941 for n>=0.at n=21A217604a(n) = Sum_{i=1..n} (-1)^{i+1} prime(i)^2, where prime(k) denotes the k-th prime: alternating sum of the squares of the first n primes.at n=23A240860