99899
domain: N
Appears in sequences
- Numbers having four 9's in base 10.at n=26A043528
- Smallest palindrome with digit sum = n.at n=44A062388
- Largest palindrome using minimum number of digits with a digit sum = n.at n=44A070244
- Near-repdigit semiprimes with 9 as repeated digit.at n=38A105990
- Palindromic brilliant numbers whose number of binary ones is also brilliant.at n=17A121209
- a(n) = 10^(2*n+1) - 10^n - 1.at n=2A181965
- Least semiprime whose digital sum is n, or 0 if no such integer exists.at n=44A213653
- The semiprimes which set new records for the sum of their decimal digits.at n=32A257652
- Nonprime base-10 palindromes whose arithmetic derivative is a base-10 palindrome.at n=32A363248
- Palindromic squarefree semiprimes such that the sum of the two prime factors is also a palindrome.at n=17A374331