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A115431 Numbers n such that the concatenation of n with n-2 gives a square. 11
6, 5346, 8083, 10578, 45531, 58626, 2392902, 2609443, 7272838, 51248898, 98009803, 159728062051, 360408196038, 523637103531, 770378933826, 998000998003, 1214959556998, 1434212848998, 3860012299771, 4243705560771 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

8083_8081 = 8991^2.

CROSSREFS

Cf. A030465, A102567, A115426, A115437, A115428, A115429, A115430, A115432, A115433, A115434, A115435, A115436, A115442.

Sequence in context: A028366 A305886 * A116135 A011788 A172649 A111152

Adjacent sequences:  A115428 A115429 A115430 * A115432 A115433 A115434

KEYWORD

base,nonn

AUTHOR

Giovanni Resta, Jan 24 2006

STATUS

approved

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Last modified November 20 02:52 EST 2018. Contains 317370 sequences. (Running on oeis4.)