126961

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 47.at n=3A031635
• Numbers m such that 11*m^2 - 7 is a square.at n=8A221763
• Primes p such that sigma(sigma(2p-1)) is a prime.at n=2A247790
• Numbers k such that sigma(sigma(2k-1)) is a prime p.at n=5A247821
• Number of subsets of {1..n} containing all of their integer quotients.at n=23A326023
• Prime numbersat n=11899