503056

Appears in sequences

• Smaller of an amicable pair: (a,b) such that sigma(a) = sigma(b) = a+b, a < b.at n=28A002025
• a(n) = Sum_{k=0..floor(n/2)} binomial(2n-2k,2k)3^k*2^(n-k).at n=8A108486
• Eight white queens and one red queen on a 3 X 3 chessboard. G.f.: (1 + 2*x)/(1 - 6*x - 2*x^2).at n=7A180029
• Irregular triangle in which row n consists of the smaller of pairs of amicable numbers of the form 2^n pq, with p and q odd primes.at n=7A180650
• Smaller members of regular amicable pairs.at n=19A215491
• Smaller of amicable pair (x, y) as they are listed in A259933.at n=28A260086
• Twin amicable numbers (m,n) where there is not any part of another amicable pair between m and n.at n=26A273259
• Amicable pairs with the property that both members have the same number of divisors.at n=22A328064