230929

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 41.at n=18A031629
• Primes with 21 as smallest positive primitive root.at n=28A061333
• Primes of form x^2 - phi(x) in increasing order.at n=29A258435
• Prime numbersat n=20514