55557

Appears in sequences

• Numbers having four 5's in base 10.at n=26A043512
• Indices of primes in sequence defined by A(0) = 47, A(n) = 10*A(n-1) + 17 for n > 0.at n=12A101736
• Primes in carryless arithmetic mod 10 in which all digits except the rightmost are zero or five.at n=30A169984
• a(n) = (5*10^n + 13)/9.at n=5A178769
• For k in {2,3,...,9} define a sequence as follows: a(0)=0; for n>=0, a(n+1)=a(n)+1, unless a(n) ends in k, in which case a(n+1) is obtained by replacing the last digit of a(n) with the digit(s) of k^2. This is k(7).at n=43A237344
• Numbers n such that n+2, n+4, n+6, n+8, n+10, n+12 and n+14 are all semiprimes.at n=5A268578
• Numbers k with digits 5 and 7 only.at n=31A284380
• Coefficients of 1/(Sum_{k>=0} [(k+1)*r]*(-x)^k), where r = 4^(1/3) and [ ] = floor.at n=16A288231
• Numbers k such that 2^k - 25 is prime.at n=22A379020