3999999
domain: N
Appears in sequences
- Numbers with digits nondecreasing and their reciprocals sum to 1/(positive integer).at n=41A045910
- Harmonic mean of digits is 7.at n=6A061546
- a(n) is the smallest composite number with the sum of digits = the n-th composite number.at n=39A073866
- Numbers with digits in nondecreasing order such that sum of the reciprocals of the digits is 1.at n=24A091783
- Smallest number whose sum of digits is 2n+1.at n=28A131668
- Smallest number whose sum of digits is 3n.at n=19A133195
- Minimum number k for which the digital sum of k*n is 3*n.at n=20A147823
- The smallest composite number larger than the n-th composite number, which has a sum of digits equal to the n-th composite number.at n=39A161551
- a(n) = 4*10^n - 1.at n=6A198970
- A number N is called a "rebel" number if there do not exist two integers a and b such that N = a + b with a > b > 0 and S(a) = S(b) where S(n) is the sum of the digits of the number n.at n=46A292514