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A115549 Numbers k such that the concatenation of k with 8*k gives a square. 0
3, 12, 28, 63, 112, 278, 1112, 2778, 11112, 27778, 111112, 277778, 1111112, 2777778, 4938272, 7716050, 11111112, 12802888, 13151250, 13504288, 13862002, 14224392, 14591458, 14963200, 15339618, 15720712, 16106482, 16496928 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

3_24 = 18^2.

CROSSREFS

Cf. A102567, A106497, A115527 - A115556.

Sequence in context: A140065 A294418 A308669 * A005995 A034503 A026557

Adjacent sequences:  A115546 A115547 A115548 * A115550 A115551 A115552

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 25 2006

STATUS

approved

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Last modified December 1 12:40 EST 2021. Contains 349429 sequences. (Running on oeis4.)