OFFSET
1,1
COMMENTS
Also, last 3 digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.
FORMULA
a(n) = 2^(A000043(n)-1) mod 1000. - Max Alekseyev, Feb 16 2024
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Omar E. Pol, Apr 02 2008
EXTENSIONS
More terms from R. J. Mathar, Feb 05 2010
a(40)-a(41) from Max Alekseyev, Feb 11 2012
a(42)-a(47) from Jinyuan Wang, Mar 14 2020
a(48) from Max Alekseyev, Feb 16 2024
STATUS
approved