711936

Appears in sequences

• Numbers k such that 1/(1/phi(k) + 1/phi(k+1) + 1/phi(k+2) + 1/phi(k+3)) is an integer.at n=32A073544
• a(n) = 6*a(n-1) + 30*a(n-2), n>2; a(0)=1, a(1)=1, a(2)=11.at n=7A154997
• Number of nonisomorphic sets of permutations of an n-set.at n=4A362766