Exponential (2,4)-perfect numbers: numbers m such that esigma(esigma(m)) = 4m, where esigma(m) is the sum of exponential divisors of m (A051377).

A328133

Exponential (2,4)-perfect numbers: numbers m such that esigma(esigma(m)) = 4m, where esigma(m) is the sum of exponential divisors of m (A051377).

Terms

    a(0) =540a(1) =3780a(2) =5940a(3) =7020a(4) =9180a(5) =10260a(6) =12420a(7) =15660a(8) =16740a(9) =19980a(10) =22140a(11) =23220a(12) =25380a(13) =28620a(14) =31860a(15) =32940a(16) =36180a(17) =38340a(18) =39420a(19) =41580a(20) =42660a(21) =44820a(22) =48060a(23) =49140a(24) =52380a(25) =54540a(26) =55620a(27) =57780a(28) =58860a(29) =61020

External references