141664

Appears in sequences

• Smaller of an amicable pair: (a,b) such that sigma(a) = sigma(b) = a+b, a < b.at n=16A002025
• Amicable numbers.at n=32A063990
• Diagonal sums of the Riordan array A116382.at n=19A116384
• Conjectured list of smallest terms of k-sociable cycles of order r.at n=26A183016
• Number of base pyramids in all dispersed Dyck paths of length n (i.e., in all Motzkin paths of length n with no (1,0)-steps at positive heights).at n=18A191394
• Numbers k such that sigma(k) = sigma(sigma(k)-k).at n=36A206708
• Abundant numbers whose aliquot sequence is abundant, deficient, abundant, ..., etc.at n=21A234969
• Amicable pairs.at n=32A259180
• Amicable pairs (x < y) ordered by nondecreasing sum (x + y) and then by increasing x.at n=32A259933
• Smaller of amicable pair (x, y) as they are listed in A259933.at n=16A260086
• Amicable pairs of even numbers.at n=22A262622
• Even amicable numbers.at n=22A262624
• List of pairs of amicable numbers (m,n) where the sum of the pair is divisible by 10.at n=18A291422
• Smaller of bi-unitary amicable pair.at n=24A292980
• Number of n X 3 0..1 arrays with each 1 adjacent to 0, 1 or 3 king-move neighboring 1s.at n=7A296646
• T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 0, 1 or 3 king-move neighboring 1s.at n=47A296651
• Amicable pairs with the property that the number of divisors of the smaller member is greater than the number of divisors of the larger member.at n=18A328063
• Number of unlabeled biconnected graphs on n vertices without 4-cycles or 5-cycles.at n=12A366223