5000005

Appears in sequences

• Numbers k such that k^2 contains only digits {0,2,5}, not ending with zero.at n=19A058425
• Turban numbers: without letters r, t, or u.at n=15A072956
• Beginning with 1 palindromes with prime successive differences.at n=38A088049
• Beginning with 1, palindromes such that successive differences are distinct primes.at n=27A088052
• a(n) = A069537(n)/2.at n=22A088404
• Numbers k such that k and k^2 use only the digits 0, 2 and 5.at n=19A136910
• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 7.at n=26A136915
• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 8.at n=29A136918
• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 9.at n=45A136920
• a(n) = n*(n^6 + 1)/2.at n=10A168029
• Consider a decimal number of k >= 2 digits m = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + ... + d_(2)*10 + d_(1). a(n) is the least number m such that the n-th iteration of the transform T(m) -> (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) returns m, or -1 if no such number exists.at n=7A243993
• Base-10 super-weak Skolem-Langford numbers.at n=17A339803