63020

Appears in sequences

• Smaller of an amicable pair: (a,b) such that sigma(a) = sigma(b) = a+b, a < b.at n=8A002025
• Smaller of amicable pair of Euler's first form with GCD a prime times a power of 2.at n=0A049025
• Amicable numbers.at n=16A063990
• Conjectured list of smallest terms of k-sociable cycles of order r.at n=18A183016
• Conjectured list of multisociable numbers.at n=29A183019
• Numbers k such that sigma(k) = sigma(sigma(k)-k).at n=20A206708
• Smaller members of regular amicable pairs.at n=5A215491
• Triangular array read by rows: row n shows the coefficients of the polynomial u(n) = c(0) + c(1)*x + ... + c(n)*x^(n) which is the numerator of the n-th convergent of the continued fraction [k, k, k, ... ], where k = (x + 1)/(x + 2).at n=47A231774
• Abundant numbers whose aliquot sequence is abundant, deficient, abundant, ..., etc.at n=10A234969
• Amicable pairs.at n=16A259180
• Amicable pairs (x < y) ordered by nondecreasing sum (x + y) and then by increasing x.at n=20A259933
• Smaller of amicable pair (x, y) as they are listed in A259933.at n=10A260086
• Amicable pairs of even numbers.at n=14A262622
• Even amicable numbers.at n=14A262624
• (1+e)-sigma amicable numbers.at n=20A274116
• 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=8A328063
• Amicable pairs with the property that the number of divisors of the smaller member is twice the number of divisors of the larger member.at n=6A328065
• Lesser of recursive amicable numbers pair: numbers m < k such that m = s(k) and k = s(m), where s(k) = A333926(k) - k is the sum of proper recursive divisors of k.at n=10A333929
• Conjectured list of numbers which are perfect, amicable, or sociable.at n=35A347770
• Number of partitions of n in which exactly one even part is repeated and odd parts are unrestricted.at n=46A353902