860574

Appears in sequences

• a(n) is the least nonsquare having square residues modulo each of the first n primes.at n=19A090983
• a(n) is the least nonsquare having square residues modulo each of the first n primes.at n=20A090983
• a(n) = number of unlabeled rooted trees on n nodes with an even number of endpoints.at n=17A253013
• a(n) is the least number k that is not a quadratic residue modulo prime(n) but is a quadratic residue modulo all previous primes.at n=20A377212