1077890

Appears in sequences

• Smaller of unitary amicable pair.at n=20A002952
• Smaller members of regular amicable pairs.at n=31A215491
• Twin amicable numbers (m,n) where there is not any part of another amicable pair between m and n.at n=36A273259
• Amicable pairs {x, y} such that y is the sum of the divisors of x that are not divided by every prime factor of x and vice versa.at n=8A307986
• Lesser of exponentially-odd amicable numbers pair: numbers m < k such that m = s(k) and k = s(m), where s(k) is the sum of proper exponential-odd divisors of k.at n=20A325847
• Amicable pairs with the property that both members have the same number of divisors.at n=26A328064
• a(n) is the smallest member of the n-th purely periodic unitary sigma aliquot cycle listed in A336216.at n=34A336219
• Smaller member of a nonexponential amicable pair: numbers (k, m) such that nesigma(k) = m and nesigma(m) = k, where nesigma(k) is the sum of the nonexponential divisors of k (A160135).at n=3A348602