Numbers n such that sigma(n)=sigma(d_1)*sigma(d_2)*...*sigma(d_k) where d_1 d_2 ... d_k is the decimal expansion of n.
A098771
Numbers n such that sigma(n)=sigma(d_1)*sigma(d_2)*...*sigma(d_k) where d_1 d_2 ... d_k is the decimal expansion of n.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =38a(10) =58a(11) =66a(12) =87a(13) =568a(14) =766a(15) =2799a(16) =6478a(17) =6785a(18) =26486a(19) =36685a(20) =36893a(21) =64788a(22) =66758a(23) =67586a(24) =69664a(25) =77686a(26) =276895a(27) =467683a(28) =474668a(29) =488973
External references
- oeis: A098771