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Search: id:A068175
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| A068175 |
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a(1) = 1; for n>1, a(n) is the smallest square > a(n-1) obtained by inserting digits into a(n-1). |
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+0
7
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| 1, 16, 169, 1369, 13689, 134689, 13446889, 1344468889, 134444688889, 13444446888889, 1344444468888889, 134444444688888889, 13444444446888888889, 1344444444468888888889, 134444444444688888888889
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(3) = 169; the smallest square obtained by inserting digits in it is 1369 hence a(4) = 1369.
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CROSSREFS
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A091874 gives square roots.
Sequence in context: A067713 A017210 A067711 this_sequence A050628 A048557 A021424
Adjacent sequences: A068172 A068173 A068174 this_sequence A068176 A068177 A068178
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 25 2002
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EXTENSIONS
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Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 11 2003
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