OFFSET
1,1
EXAMPLE
If x=11 and y=65, then (3*11*65-65-6)/(3*11+1)=2074/34=61=a(1).
If x=13 and y=77, then (3*13*77-77-6)/(3*13+1)=2820/40=73=a(2).
If x=31 and y=185, then (3*31*185-185-6)/(3*31+1)=17014/94=181=a(3).
If x=41 and y=245, then (3*41*245-245-6)/(3*41+1)=29884/124=241=a(4).
If x=71 and y=425, then (3*71*425-425-6)/(3*71+1)=90094/214=421=a(5).
If x=73 and y=437, then (3*73*437-437-6)/(3*73+1)=95260/220=433=a(6),
etc.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Aug 28 2008
STATUS
approved