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A034988
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a(n) is root of smallest square starting with a string of n 'digit_6's.
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2
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8, 257, 2581, 2582, 258198, 2581988, 8164966, 25819889, 816496581, 8164965809, 258198889746, 2581988897471, 8164965809277, 25819888974716, 258198889747161, 816496580927726, 81649658092772603, 2581988897471611256, 8164965809277260327
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(5) = 258198^2 = {66666}207204.
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MATHEMATICA
| For[ i = 1, i < 20, i++, zeros = 0; isFound = False; While[ !isFound, low = Ceiling[ Sqrt[ 2/3*(10^i - 1)*10^zeros ] ]; high = Floor[ Sqrt[ (2/3*(10^i - 1) + 1)*10^zeros ] ]; isFound = (low <= high); zeros++ ]; Print[ low, " ", low^2 ] ]
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CROSSREFS
| Cf. A034989.
Sequence in context: A140339 A103488 A041487 * A172127 A162083 A081058
Adjacent sequences: A034985 A034986 A034987 * A034989 A034990 A034991
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 1998.
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EXTENSIONS
| Program and more terms from Jonathan Cross (jcross(AT)wcox.com), Oct 15 2001
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