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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The growing square sequence for 1 and 6, 2 and 5, 4 and 9 in pairs are the same.
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FORMULA
| For n>=4, a(n) = 38416*100^(n-4)
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EXAMPLE
| a(2)=81 hence a(3) = 841 the smallest square formed from 81.
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CROSSREFS
| Cf. A068175, A068176, A068177, A068178, A068616.
Sequence in context: A007792 A098308 A055996 * A007778 A065440 A092366
Adjacent sequences: A068614 A068615 A068616 * A068618 A068619 A068620
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 25 2002
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EXTENSIONS
| 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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