OFFSET
0,2
COMMENTS
Some entries of A181762 occur twice some only once.
The sequence gives the distance between first and second positions of A181762(n),
a(n)=0 if A181762(n) occurs only once.
The numbers that occur in A181762 only once are 0, 2, 4, 6, 8, 10, 12, 14, 18, 20, 22, 24, 26, 30, 32, 34, 36, 38, 42, 44, 46, ...
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Mar 10 2011
STATUS
approved