A187486 - OEIS

%I #6 Mar 30 2012 17:26:37

%S 0,15,0,25,0,35,0,45,0,55,0,65,0,75,0,85,15,95,0,105,0,115,0,125,0,

%T 135,0,145,25,155,0,165,0,175,0,185,0,195,0,205,35,215,0,225,0,235,0,

%U 245,0,255,0,265,45,275,0,285,0,295,0,305,0,315,0,325,55,335,0,345,0,355

%N Distance between first and second positions of  A181762(n).

%C Some entries of A181762 occur twice some only once.

%C The sequence gives the distance between first and second positions of A181762(n),

%C a(n)=0 if A181762(n) occurs only once.

%C 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, ...

%Y Cf. A181762.

%K nonn

%O 0,2

%A _Zak Seidov_, Mar 10 2011