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a(n)=sqrt(A178825(n)+A178825(n+1)).
1

%I #17 Sep 18 2015 15:39:32

%S 2,4,6,8,10,14,20,24,30,36,54,68,72,84,94,102,120,134,138,168,198,258,

%T 310,320,328,338,348,360,370,390,426,446,450,510,574,588,624,660,672,

%U 692,728,754,760,778,804,870,940,974,996,1014,1030,1036,1040,1044,1086,1142,1166,1174,1180,1194,1206,1210,1212,1230,1248,1260,1280,1292,1296

%N a(n)=sqrt(A178825(n)+A178825(n+1)).

%H <a href="/A177867/b177867.txt">Table of n, a(n) for n = 1..69</a>

%e n=1: A178825(1)+A178825(2)=1+3=2^2, hence a(1)=2,

%e n=2: A178825(2)+A178825(3)=3+13=4^2, hence a(2)=4,

%e n=3: A178825(3)+A178825(4)=13+23=6^2, hence a(3)=6.

%Y Cf. A178825.

%K nonn

%O 1,1

%A _Zak Seidov_, Dec 28 2010