90009

Appears in sequences

• Divisors of 99999999.at n=32A027890
• Numbers n such that in n^3 the parity of digits alternates.at n=35A030159
• Palindromes that start with 9.at n=22A043044
• n-th row of the following triangle contains n palindromic multiples of n beginning with n. Sequence contains the triangle by rows.at n=42A083764
• Numbers whose set of base 10 digits is {0,9}.at n=17A097256
• Palindromes with either no internal digits or all internal digits are 0.at n=45A109882
• Positive integers n such that the sum of the squares of all the substring decompositions of n is a multiple of n.at n=35A154562
• Numbers n with property that n^2 starts and ends with 81.at n=10A159775
• Numbers such that each digit is the sum of two or more other digits.at n=32A203591
• Palindromic composite numbers starting with a digit 9.at n=20A222729
• Palindromes of the form i^2 + reverse(i)^2.at n=17A256398
• Pseudoprimes to base 10 that are not squarefree.at n=12A306449
• Numbers m such that the largest digit in the decimal expansion of 1/m is 1.at n=19A333402
• Proceeding from left to right, between any two consecutive digits (d_i, d_i+1) of an integer k, write down apart the lacking consecutive digits, in increasing order if d_i <d_i+1 or decreasing order if d_i>d_i+1. If abs(d_i - d_i+1) = 0 or 1 no digit is added. Sequence lists integers k that divide such resulting numbers.at n=7A381732
• Numbers whose digits all belong to the same residue class mod 9.at n=57A385298