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n-th single or isolated number plus n-th non-single or nonisolated number.
0

%I #4 Mar 30 2012 18:52:35

%S 2,5,9,17,25,31,39,47,53,60,67,75,83,89,98,103,110,119,126,133,139,

%T 154,159,167,181,189,196,201,208,216,230,237,251,264,271,277,285,297,

%U 305,312,320,328,334,347,362,368,374,389,396,409,415,422,431,438,445,451

%N n-th single or isolated number plus n-th non-single or nonisolated number.

%F a(n)=A167706(n)+A167707(n).

%e a(1)=2+0=2, a(2)=4+1=5, a(3)=6+3=9, a(4)=12+5=17.

%Y Cf. A167706, A167707.

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Nov 14 2009

%E All terms > 110 corrected by _R. J. Mathar_, May 30 2010