27955

Appears in sequences

• Numbers k such that 7*(10^k - 1)/9 - 3*10^floor(k/2) is a palindromic wing prime (also known as near-repdigit palindromic prime).at n=11A077781
• Greatest number m such that the fractional part of (1024/1000)^A153677(n) <= 1/m.at n=11A153681
• Number of numbers in row n of the array at A243928.at n=26A243930
• Odd numbers k such that Sum_{j=1..(k-1)/2, gcd(j,k)=1} 1/j == -2*q_2(k) + k*q_2(k)^2 (mod k^3), where q_2(k) = (2^phi(k) - 1)/k is the Euler quotient of k to base 2.at n=10A329706