486721

Properties

Appears in sequences

• a(n) is the n-th prime of the form n*x^2+1.at n=19A128970
• Primes of the form 5k^2 + 1.at n=19A137530
• Self-inverse permutation of natural numbers: complementary pair ludic/nonludic numbers (A003309/A192607) entangled with the same pair in the opposite order, nonludic/ludic. See Formula.at n=56A235491
• Numbers n such that if n = a U b (where U denotes concatenation) then sigma*(a) + sigma*(b) = abs(sigma*(n) - n), where sigma*(n) is the sum of the anti-divisors of n.at n=33A239686
• Prime numbersat n=40508