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Search: id:A080160
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| A080160 |
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Consider those Demlo numbers A002477 whose digit sums are squares; sequence gives these digit sums. |
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+0
6
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| 1, 4, 9, 16, 25, 36, 49, 64, 81, 324, 441, 576, 729, 900, 1089, 1296, 2025, 2304, 2601, 2916, 3249, 3600, 3969, 5184, 5329, 5476, 5625, 5776, 5929, 6084, 6241, 6400, 6561, 6724, 6889, 7056, 7225, 7396, 7569, 7744, 7921, 8100, 9801, 10404, 11025, 11664
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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These are the squares in A080151.
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LINKS
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Eric Weisstein's World of Mathematics, Demlo Number
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MAPLE
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b:=n->sum(convert(((10^(n+1)-1)/9)^2, base, 10)[j], j=1..2*n+1): a:=proc(n) if type(sqrt(b(n)), integer)=true then b(n) else fi end: seq(a(n), n=0..2000); (Deutsch)
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CROSSREFS
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Cf. A080161, A080162, A002477, A080151.
Sequence in context: A078255 A077356 A077357 this_sequence A110723 A084617 A068879
Adjacent sequences: A080157 A080158 A080159 this_sequence A080161 A080162 A080163
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com) Jun 19 2005.
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 19 2005
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