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A086340 Numbers n such that 1 + (n-1)*n*(n+1) is a square. 0
1, 3, 5, 56 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

M. Lambrou, Solution to problem 2411, Crux Mathematicorum, Feb. 2000 26(1) 59-60 CMS.

LINKS

Table of n, a(n) for n=1..4.

PROG

(PARI) isok(n) = issquare(1 + (n-1)*n*(n+1)) \\ Michel Marcus, Jul 27 2013

CROSSREFS

Sequence in context: A260225 A020462 A087602 * A248923 A155121 A106914

Adjacent sequences:  A086337 A086338 A086339 * A086341 A086342 A086343

KEYWORD

fini,nonn

AUTHOR

Lekraj Beedassy, Sep 02 2003

STATUS

approved

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Last modified November 18 09:25 EST 2019. Contains 329261 sequences. (Running on oeis4.)