55355

Appears in sequences

• Numbers having four 5's in base 10.at n=13A043512
• Let b(1)=x, b(2)=y, k*b(k)=(2k-1)*b(k-1) + 3(k+1)*b(k-2); then b(n)=a(n)*x+c(n)/3*y.at n=11A076148
• Near-repdigit semiprimes with 5 as repeated digit.at n=28A105986
• Palindromic primes in base 6 (written in base 6).at n=30A117701
• Binomial transform of [1, 4, 10, 20, 0, 0, 0, ...].at n=26A143131
• a(n) = 5*(10^(2*n+1)-1)/9 - 2*10^n.at n=2A332153