7868025

Appears in sequences

• Odd abundant numbers whose abundance is odd.at n=19A156942
• Numbers k such that phi(k)^phi(k) == 1 (mod sigma(k)).at n=31A248861
• Odd numbers k such that sigma(k) > 2*k and A003415(sigma(k)) < k, where A003415 is the arithmetic derivative, and sigma is the sum of divisors function.at n=8A347890