642086

Appears in sequences

• Smallest multiple of n with property that digits are even and each digit is two less (mod 10) than the previous digit, if such a multiple exists; otherwise -1.at n=19A062885
• Smallest multiple of n with property that digits are even and each digit is two less (mod 10) than the previous digit, if such a multiple exists; otherwise -1.at n=38A062885
• a(n) = Sum_{k=0..n} binomial(4*n+2,k) * binomial(4*n-k,n-k).at n=5A386845