OFFSET
1,1
COMMENTS
Also, concatenation of first two digits and last two digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Omar E. Pol, Apr 02 2008
EXTENSIONS
More terms from Jinyuan Wang, Mar 14 2020
STATUS
approved