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A068178
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a(1) = 4; for n>1, a(n) is the smallest square > a(n-1) obtained by inserting digits into a(n-1).
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3
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4, 49, 1849, 18496, 1784896, 177848896, 17778488896, 1777784888896, 177777848888896, 17777778488888896, 1777777784888888896, 177777777848888888896, 17777777778488888888896
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(2)=49 hence a(3) = 1849 the smallest square formed from 49.
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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