

A309553


Imperfect numbers of the form 2^(2^k1)*F_1*F_2*...*F_(k1), where F is a Fermat number.


0




OFFSET

1,1


COMMENTS

Numbers of this form are imperfect only for k = 2, 3, 4, 5.


LINKS



EXAMPLE

For k=2, 2^3*F_1 = 8*5 = 40, so 40 is in the sequence.


CROSSREFS



KEYWORD

nonn,fini,full


AUTHOR



STATUS

approved



