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A115553
Numbers k such that the concatenation of k with 9*k gives a square.
0
2041, 8164, 2366863905325444, 5325443786982249, 9467455621301776, 2040816326530612244897959183673469387755102041, 8163265306122448979591836734693877551020408164
OFFSET
1,1
EXAMPLE
2041_18369 = 14287^2.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 25 2006
STATUS
approved