The aliquot sequence is constant for these numbers, whose examples other than the first one have digital root 1.
The aliquot sequence is constant for these numbers, whose examples other than the first one have digital root 1. Currently-known examples of them are in one-to-one correspondence with Mersenne prime numbers, and there are a number of restrictions on-- but no (*) proof about--the existence of odd versions of these numbers. Equaling the sum of its proper divisors, for 10 points, give this type of number whose first two examples are 6 and 28.
The aliquot sequence is constant for these numbers, whose examples other than the first one have digital root 1.
perfect numbers