OFFSET
2,3
EXAMPLE
Example (a(7)=2): There are two natural numbers 14 and 15 with 7 steps in this iteration. 14-2=12, 12-2=10, 10-2=8, 8-2=6, 6-2=4, 4-2=2, 2-2=0; 15-3=12, 12-2=10, 10-2=8, 8-2=6, 6-2=4, 4-2=2, 2-2=0.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Feb 15 2010
STATUS
approved