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A115541 Numbers k such that the concatenation of 5*k with k gives a square. 0
1020408163265306122449, 4081632653061224489796, 9183673469387755102041, 106678449690695619239994950132559020325716449943188991289, 123721752304002019946976391869713420022724403484408534276 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

5102040816326530612245_1020408163265306122449 = 7142857142857142857143^2.

CROSSREFS

Cf. A102567, A106497, A115527 - A115556.

Sequence in context: A217431 A173471 A291215 * A172564 A095438 A115503

Adjacent sequences:  A115538 A115539 A115540 * A115542 A115543 A115544

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 25 2006

STATUS

approved

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Last modified August 10 06:08 EDT 2022. Contains 356029 sequences. (Running on oeis4.)