219313

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 55.at n=8A031643
• Odd integers k>=5 such that 2^((k-1)/2)-1 == 0 (mod k*(k-3)/2).at n=17A337848
• Prime numbersat n=19553