131391

Appears in sequences

• From discordant permutations.at n=7A002634
• Indices of primes in sequence defined by A(0) = 77, A(n) = 10*A(n-1) - 43 for n > 0.at n=11A056257
• a(n) = Sum_{k=1..n} 2^(floor(n/k) - 1).at n=17A345028