90909

Appears in sequences

• Differences between two positive cubes in exactly 3 ways.at n=2A014441
• a(n) = 9*a(n-1) + 10*a(n-2).at n=6A015585
• a(n) = T(2n-1,n), where T is the array defined in A026105.at n=6A026111
• Palindromes of form k^2 + k + 7.at n=7A027723
• a(n) = floor(10^6/n).at n=10A033426
• Palindromic numbers which are the difference of two positive cubes.at n=19A038808
• Palindromes that start with 9.at n=31A043044
• Sum of two (possibly negative) cubes in at least 3 ways.at n=13A051383
• a(n) = Smallest nontrivial number k > 9 such that |first (leftmost) decimal digit of k - second digit + third digit - fourth digit ...| = n.at n=27A060982
• Smallest number m such that first digit - second digit + third digit - fourth digit ... (of m) = n.at n=27A061479
• a(n) = Smallest nontrivial number k > 9 such that first (leftmost) digit - second digit + third digit - fourth digit ... of k = n.at n=27A061882
• a(n) = n^5 - n^4 + n^3 - n^2 + n - 1.at n=10A062159
• Partition the nonnegative integers into minimal groups whose sums are palindromes; this sequence gives the sums.at n=37A072482
• n-th row of the following triangle contains n palindromic multiples of n beginning with n. Sequence contains the triangle by rows.at n=43A083764
• Numbers whose set of base 10 digits is {0,9}.at n=21A097256
• n times n+7 gives the concatenation of two numbers m and m-6.at n=10A116250
• Inverse of A164844.at n=22A164881
• Numbers n (relatively prime to 10) such that the decimal form of the period of 1/n is prime.at n=15A175545
• Numbers n such that the decimal digits of n are not present in k*n, k=2..9.at n=15A175637
• Numbers with the property that all pairs of consecutive digits differ by 9.at n=12A198486