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A076043 a(1)=2; for n>1, a(n) is smallest squarefree number (greater than 1) not occurring earlier such that a(n) + a(n-1) is a square. 0

%I

%S 2,7,29,35,14,11,5,31,33,3,6,10,15,21,43,38,26,23,13,51,30,19,17,47,

%T 34,66,55,89,107,37,159,97,227,62,59,22,42,39,61,83,86,58,111,85,239,

%U 122,74,70,155,41,103,93,163,161,95,101,223,138,87,57,139,185,71,73,123,46

%N a(1)=2; for n>1, a(n) is smallest squarefree number (greater than 1) not occurring earlier such that a(n) + a(n-1) is a square.

%C Conjecture: every squarefree number except 1 is a member.

%K nonn,easy

%O 0,1

%A _Amarnath Murthy_, Nov 03 2002

%E Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003

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Last modified October 22 13:19 EDT 2019. Contains 328318 sequences. (Running on oeis4.)