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A309907
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a(n) is the square of the number consisting of one 1 and n 3's: (133...3)^2.
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3
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1, 169, 17689, 1776889, 177768889, 17777688889, 1777776888889, 177777768888889, 17777777688888889, 1777777776888888889, 177777777768888888889, 17777777777688888888889, 1777777777776888888888889, 177777777777768888888888889, 17777777777777688888888888889
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OFFSET
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0,2
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COMMENTS
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All terms are zeroless (elements of A052382).
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LINKS
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FORMULA
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G.f.: -(40*x^2+58*x+1)/((x-1)*(100*x-1)*(10*x-1)).
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MAPLE
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a:= n-> parse(cat(1, 3$n))^2:
seq(a(n), n=0..18);
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PROG
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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