99529

Properties

Appears in sequences

• Let phi = arccos(1/3), the dihedral angle of the regular tetrahedron. Then cos(n*phi) = a(n)/3^n.at n=11A025172
• First of four consecutive primes p,q,r,s such that the sum of numerator and denominator of p/q + q/r, p/q + r/s, and q/r + r/s, are all prime.at n=23A355696
• Primes having only {2, 5, 9} as digits.at n=27A385786
• Prime numbersat n=9550