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Search: id:A034988
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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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+0
3
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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; listen)
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OFFSET
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1,1
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EXAMPLE
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a(5) = 258198^2 = {66666}207204.
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MATHEMATICA
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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
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Cf. A034989.
Sequence in context: A140339 A103488 A041487 this_sequence A081058 A003386 A098275
Adjacent sequences: A034985 A034986 A034987 this_sequence A034989 A034990 A034991
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KEYWORD
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nonn,base
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 1998.
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EXTENSIONS
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Program and more terms from Jonathan Cross (jcross(AT)wcox.com), Oct 15 2001
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