109989

Appears in sequences

• Numbers k such that 9*k = (k written backwards), k > 0.at n=2A001232
• Numbers k such that k written backwards is a nontrivial multiple of k.at n=4A008919
• Numbers k such that k and 9*k are anagrams.at n=23A023093
• Erroneous version of A001232.at n=2A039684
• 1/3-Smith numbers.at n=10A050225
• Non-palindromic numbers n, not divisible by 10, such that either n divides R(n) or R(n) divides n, where R(n) is the digit-reversal of n.at n=8A071685
• Non-palindromic numbers such that either x=q1.Rev[x] or Rev[x]=q2.x, where R[x]=A004086[x] and q1 or q2 are integers not divisible by 10.at n=34A071687
• Non-palindromes in A110751; that is, non-palindromic numbers n such that n and R(n) have the same prime divisors, where R(n) = digit reversal of n.at n=20A110819
• Numbers k such that gcd(k^2, reverse(k^2)) = k.at n=17A175823
• Repunits with even indices multiplied by 99, i.e., 99*(11, 1111, 111111, 11111111, ...).at n=1A274755