

A233416


cperfect numbers.


3




OFFSET

1,1


COMMENTS

A number k is called a cperfect number if the sum of its proper cdivisors equals k.
For the definition of a cdivisor of an integer, see comment in A124771.
Sequence in binary: 1011, 1000111, 11100010, 111001011100, 100001000001111, 100010111000111100011, 10010000000101000110011, 100001111110010100110011...
Next term > 10^7. (End)


LINKS



FORMULA



EXAMPLE

For n=11 which is a concatenation of binary parts (10)(1)(1); we have proper positive cdivisors 1, 2, 3, and 5, the sum of which is 11, so 11 is in the sequence.


CROSSREFS



KEYWORD

nonn,more,base


AUTHOR



EXTENSIONS



STATUS

approved



