A130289 Record values in A130280: minima of { m>1 | (2n+1)^2(m^2-1)+1 is a square} bigger than for all preceding n.

3, 5, 7, 11, 13, 19, 21, 29, 31, 169, 419, 461, 3269, 7127, 3877019, 22783559, 215308729

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..17.

Prog

(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 )}

Crossrefs

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

Sequence in context: A287437 A126991 A264754 * A071329 A109358 A216285

Adjacent sequences: A130286 A130287 A130288 * A130290 A130291 A130292

Keyword

nonn

Author

M. F. Hasler, May 24 2007

Status

approved