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Search: id:A102832
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| A102832 |
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Number of n-digit squares which contain the string "666" but not "6666". |
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+0
1
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| 0, 0, 0, 0, 0, 0, 3, 21, 78, 302, 1139, 4156, 14791, 52529, 183565, 635691, 2183533, 7314869, 25303217
(list; graph; listen)
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OFFSET
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1,7
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MATHEMATICA
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fQ[n_] := StringPosition[ ToString[n^2], "666"] != {} && StringPosition[ ToString[n^2], "6666"] == {}; t = Table[0, {20}]; Do[ If[ fQ[n], t[[ Ceiling[ Log[10, n^2]] + 1]]++ ], {n, 3162277661}]; t (from Robert G. Wilson v Mar 10 2005)
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CROSSREFS
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Cf. A052041, A102794, A102807 A032746.
Sequence in context: A109721 A067002 A110450 this_sequence A112851 A034490 A071351
Adjacent sequences: A102829 A102830 A102831 this_sequence A102833 A102834 A102835
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KEYWORD
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nonn,base
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AUTHOR
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James Buddenhagen (jbuddenh(AT)gmail.com), Feb 27 2005
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EXTENSIONS
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a(13), a(14), a(15), a(16), a(17), a(18) & a(19) from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 3 2005
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