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Record values in A130280: minima of { m>1 | (2n+1)^2(m^2-1)+1 is a square} bigger than for all preceding n.
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%I #5 Jun 14 2017 00:31:07

%S 3,5,7,11,13,19,21,29,31,169,419,461,3269,7127,3877019,22783559,

%T 215308729

%N Record values in A130280: minima of { m>1 | (2n+1)^2(m^2-1)+1 is a square} bigger than for all preceding n.

%C Most elements of this sequence seem to be 1,2 or 4 times a prime.

%o (PARI) A130289( L=999, S=1 )={ local( R, T ); for( n=S, L, if( issquare(n) || R >= T = A130280(n), next ); print1( T ", " ); R=T )}

%Y Cf. A084702, A130280, A130283, A130284, A130288.

%K nonn

%O 1,1

%A _M. F. Hasler_, May 24 2007