Practical numbers: positive integers m such that every k <= sigma(m) is a sum of distinct divisors of m. Also called panarithmic numbers.
A005153
Practical numbers: positive integers m such that every k <= sigma(m) is a sum of distinct divisors of m. Also called panarithmic numbers.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =6a(4) =8a(5) =12a(6) =16a(7) =18a(8) =20a(9) =24a(10) =28a(11) =30a(12) =32a(13) =36a(14) =40a(15) =42a(16) =48a(17) =54a(18) =56a(19) =60a(20) =64a(21) =66a(22) =72a(23) =78a(24) =80a(25) =84a(26) =88a(27) =90a(28) =96a(29) =100
External references
- oeis: A005153