21999978

Appears in sequences

• Numbers k such that 4*k = (k written backwards), k > 0.at n=5A008918
• Numbers k such that k written backwards is a nontrivial multiple of k.at n=11A008919
• 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=19A071685
• Numbers n such that two applications of 'Reverse and Subtract' lead to n, whereas one application does not lead to n.at n=9A072141
• Numbers k which have exactly 14 representations as a product of two palindromes.at n=3A125832