209933

Appears in sequences

• Quasi-Carmichael numbers to base 8: squarefree composites n such that (n,2*3*5*7) = 1 and prime p|n ==> p-8|n-8.at n=8A029555
• 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 70.at n=6A031658
• Composite squarefree numbers n such that p-d(n) divides n-d(n), where p are the prime factors of n and d(n) the number of divisors of n.at n=35A228300
• Quasi-Carmichael numbers to at least one negative base and at least one positive base.at n=25A257759
• Number of n-node connected sensed planar maps with an external face in which all internal faces are triangles.at n=8A378335