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Search: id:A068617
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| A068617 |
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Starting from a(1)=8, each subsequent term is the minimal square obtained by inserting at least one digit in the previous term. |
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| 8, 81, 841, 38416, 3841600, 384160000, 38416000000, 3841600000000, 384160000000000, 38416000000000000, 3841600000000000000, 384160000000000000000, 38416000000000000000000
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OFFSET
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1,1
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COMMENT
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The growing square sequence for 1 and 6, 2 and 5, 4 and 9 in pairs are the same.
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FORMULA
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For n>=4, a(n) = 38416*100^(n-4)
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EXAMPLE
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a(2)=81 hence a(3) = 841 the smallest square formed from 81.
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CROSSREFS
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Cf. A068175, A068176, A068177, A068178, A068616.
Sequence in context: A007792 A098308 A055996 this_sequence A007778 A065440 A092366
Adjacent sequences: A068614 A068615 A068616 this_sequence A068618 A068619 A068620
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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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More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), Sep 24 2009
Edited and extended by Max Alekseyev (maxale(AT)gmail.com), Oct 12 2009
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