142290

Appears in sequences

• Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).at n=25A076376
• Numbers n such that sigma(n) = 12*phi(n).at n=15A104902
• (1+e)-sigma amicable numbers.at n=30A274116
• Let s(k) denote the sum of the even proper divisors of k. The sequence lists the pairs of numbers (x, y) such that s(x) = y and s(y) = x.at n=21A279812
• List of ordered pairs (x, y) from A279812.at n=21A279950
• 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=16A322541
• Lesser of modified exponential amicable pairs.at n=13A323758
• 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=6A325847
• 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=15A333929
• Numbers k such that binomial(k^2,k) == 0 (mod k^3).at n=22A371474