OFFSET
1,1
COMMENTS
The second group of numbers in A003587.
EXAMPLE
2=II. 4=IV. 6=VI. 9=IX. 11=XI. 15=XV.
CROSSREFS
KEYWORD
nonn,base,fini,full,easy,less
AUTHOR
Kausthub Gudipati, Sep 20 2011
STATUS
approved