249217

Properties

Appears in sequences

• Primes of the form 2*p^2 - 1, where p is prime.at n=25A092057
• a(n) = 2048n^2 + 128n + 1.at n=10A157476
• Least positive integer which starts a chain of exactly n primes under the map p -> p+p'+p'', where p' = least prime > p.at n=7A226291
• Numbers n for which each of the digits 0-9 appears exactly once as first digit in the orbit of n under iterations of n -> (first digit of n)*(n with first digit removed) until a single digit is reached; no leading zeros allowed.at n=9A257299
• Prime numbersat n=21981