100485

Appears in sequences

• Smaller of an amicable pair: (a,b) such that sigma(a) = sigma(b) = a+b, a < b.at n=13A002025
• Triangle giving a(n,k) = number of (n,k) labeled Greg trees (n >= 2, 0 <= k <= n-2).at n=26A048159
• Amicable numbers.at n=26A063990
• Conjectured list of smallest terms of k-sociable cycles of order r.at n=23A183016
• Numbers k such that sigma(k) = sigma(sigma(k)-k).at n=30A206708
• Smaller members of regular amicable pairs.at n=9A215491
• Abundant numbers whose aliquot sequence is abundant, deficient, abundant, ..., etc.at n=18A234969
• Amicable pairs.at n=26A259180
• Amicable pairs (x < y) ordered by nondecreasing sum (x + y) and then by increasing x.at n=26A259933
• Smaller of amicable pair (x, y) as they are listed in A259933.at n=13A260086
• Amicable pairs of odd numbers.at n=6A262623
• Odd amicable numbers.at n=6A262625
• (1+e)-sigma amicable numbers.at n=26A274116
• List of pairs of amicable numbers (m,n) where the sum of the pair is divisible by 10.at n=12A291422
• 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=14A328063
• 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=12A328065
• 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=13A333929
• Partition the integers from 1 to n into three groups with consecutive numbers, then a(n) is the maximum value of the sum of the numbers in the second group multiplied by the minimum of the sum of the numbers in the first and third groups.at n=39A342713
• Number of ways to place a non-attacking black king and white king on an n X n board, up to rotation and reflection.at n=30A357723