68900

Appears in sequences

• a(n) = (7*n+1)*(7*n+6).at n=37A001526
• Square roots of sums of squares of divisors in A046655.at n=19A046656
• Square roots of sums of squares of divisors in A046655.at n=20A046656
• The common value of sigma_2 for square-amicable numbers, sigma_2(m)=sigma_2(n), m<n.at n=20A110929
• a(n) = size of the n-th term in S(10) (defined in Comments).at n=5A158577
• Number of binary strings of length n that can be written as the concatenation of nontrivial powers of other strings.at n=17A265642
• a(n) = A068346(A276086(n)), where A068346 is the second arithmetic derivative, and A276086 is the primorial base exp-function.at n=58A370131