240312

Appears in sequences

• Absolute value of coefficient of term [x^(n-3)] in characteristic polynomial of maximum matrix A of size n X n, where n >= 3. Maximum matrix A(i,j) is MAX(i,j), where indices i and j run from 1 to n.at n=15A112459
• Numbers n such that sigma(n) = 10*phi(n) (where sigma=A000203, phi=A000010).at n=22A171256
• Number of edge covers in the n-sun graph.at n=2A290933
• Number of parts in all partitions of n with largest multiplicity ten.at n=43A320380
• Lesser of semi-unitary amicable numbers pair: numbers (m, n) such that susigma(m) = susigma(n) = m + n, where susigma(n) is the sum of the semi-unitary divisors of n (A322485).at n=21A322541
• Lesser of modified exponential amicable pairs.at n=18A323758
• 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=10A325847
• 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=21A333929