100126

Appears in sequences

• Numbers k such that the number of primes <= k is phi(phi(k)).at n=30A063999
• a(n) = n*(6*n^2 - 8*n + 3).at n=26A272378
• a(n) = number of subsets of {1, 2, ..., n} that represent the first k divisors of m for some positive integers m and 1 <= k <= A000005(m).at n=39A378314