157157

Appears in sequences

• Double primes: concatenation of the n-th prime with itself.at n=36A176597
• Six-digit exclusionary squares: 6-digit numbers whose squares comprise digits none of which appears in the number itself.at n=27A195438
• Consider a decimal number of k>=2 digits x = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + … + d_(2)*10 + d_(1) and the transform T(x)-> (d_(k)+d_(k-1) mod 10)*10^(k-1) + (d_(k-1)+d_(k-2) mod 10)*10^(k-2) + … + (d_(2)+d_(1) mod 10)*10 + (d_(1)+d(k) mod 10). Sequence lists the numbers x such that x divides T(x).at n=38A244287