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A115551
Numbers k such that the concatenation of 8*k with k gives a square.
1
1, 4, 9, 89, 889, 8889, 88889, 888889, 8888889, 88888889, 888888889, 1026765584, 1066636289, 1107266436, 1148656025, 1190805056, 1233713529, 1277381444, 1321808801, 1366995600, 1412941841, 1459647524, 1507112649, 1555337216
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..24.
EXAMPLE
8_1 = 9^2.
CROSSREFS
Cf.
A102567
,
A106497
,
A115527
-
A115556
.
Sequence in context:
A248245
A368629
A077530
*
A227419
A242097
A220972
Adjacent sequences:
A115548
A115549
A115550
*
A115552
A115553
A115554
KEYWORD
nonn
,
base
AUTHOR
Giovanni Resta
, Jan 25 2006
STATUS
approved
