89210

Appears in sequences

• Numbers n such that 237*2^n-1 is prime.at n=42A050877
• Numbers k such that the number of primes <= k is phi(phi(k)).at n=28A063999
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.at n=11A148205