56898

Appears in sequences

• Numbers k such that 3*10^k + 8*R_k - 1 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=4A102979
• Numbers k such that Sum_{d|k} sigma(d)^3/d is an integer, where d are the divisors of k.at n=12A226566
• a(n) = Sum_{i=0..n} digsum_6(i)^4, where digsum_6(i) = A053827(i).at n=35A231675
• a(n) = Sum_{i=0..n} digsum_7(i)^4, where digsum_7(i) = A053828(i).at n=35A231679