217517

Properties

Appears in sequences

• Josephus problem: numbers m such that, when m people are arranged on a circle and numbered 1 through m, the final survivor when we remove every 4th person is one of the first three people.at n=37A005427
• 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 49.at n=8A031637
• a(1) = 1 and a(n) = ceiling((Sum_{k=1..n-1} a(k))/3) for n >= 2.at n=45A072493
• Smallest prime p such that the multiplicative order of 8 modulo p is n, or 0 if no such prime exists.at n=46A372798
• Prime numbersat n=19409