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A115540
Numbers k such that k^2 is the concatenation of two numbers m and 5*m.
0
14285714285714285715, 28571428571428571430, 42857142857142857145, 1627906976744186046511627906976745, 1860465116279069767441860465116280
OFFSET
1,1
EXAMPLE
14285714285714285715^2 = 2040816326530612245_10204081632653061225.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 25 2006
STATUS
approved