110928

Appears in sequences

• Initial values for f(x)=phi(sigma(x)) such that iteration of f ends in cycle of length=11.at n=9A096888
• Number of double palindrome structures of length n using exactly three different symbols.at n=17A328689
• Number of subsets of {1..n} containing n such that it is possible to choose a different prime factor of each element (choosable).at n=30A370586