117990

Appears in sequences

• Averages y of twin prime pairs that satisfy y = x^2 + x - 2.at n=19A214840
• Least integer m > 0 with pi(m*n) = sigma(m), where sigma(m) is the sum of all positive divisors of m.at n=40A247603
• Start with 443; if even, divide by 2; if odd, add next three primes: Orbit of 443 under iterations of A174221, the "PrimeLatz" map.at n=25A293978
• a(n) is the least number x such that x^2 + 1 and 2^x + 1 are both divisible by A387595(n).at n=50A387642