85173

Appears in sequences

• Numbers k such that 7*2^k + 5 is prime.at n=27A058595
• Consider a number of k digits n = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + … + d_(2)*10 + d_(1). Sequence lists the numbers n such that Sum_{i=1..k-1}{phi(Sum_{j=1..i}{d_(j)*10^(j-1)})} = Sum_{i=1..k-1}{sigma(Sum_{j=1..i}{d_(k-j+1)*10^(i-j)})} (see example below).at n=25A244069
• Odd numbers k such that A292270((k-1)/2) is a square < ((k-1)/2)^2.at n=30A292379