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A115544
Numbers k such that k^2 is the concatenation of two numbers m and 6*m.
0
4, 142857142857142857142857142857142858, 285714285714285714285714285714285716, 142857142857142857142857142857142857142857142857142857142857142857142857142858
OFFSET
1,1
EXAMPLE
4^2 = 1_6.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 25 2006
STATUS
approved