19127

Appears in sequences

• Indices of primes in sequence defined by A(0) = 27, A(n) = 10*A(n-1) - 13 for n > 0.at n=13A101962
• Numbers k such that sigma(k) - phi(k) is a 4th power.at n=23A115918
• Numbers m such that Sum_{i=1..m} omega(i)^2 is divisible by m, where omega is A001221.at n=8A145191
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 918", based on the 5-celled von Neumann neighborhood.at n=29A290673