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A048350
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a(n)^2 is the smallest square containing exactly n 5's.
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1
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5, 75, 235, 745, 22485, 22925, 235065, 505525, 2356384, 23569166, 227069495, 674919666, 3931354166, 7450205075, 39969432765, 524933839166, 2134374738666, 4904646324166, 23802428354166
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OFFSET
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1,1
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COMMENTS
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a(20) > 10^14. - Giovanni Resta, Jul 27 2018
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LINKS
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Table of n, a(n) for n=1..19.
Eric Weisstein's World of Mathematics, Square Number
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MATHEMATICA
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k := 1; For[n = 1, n < 30000, n++, If[DigitCount[n^2][[5]] == k, k++; Print[n]]] (* Stefan Steinerberger, Apr 09 2006 *)
a[n_] := Module[{i = 1}, While[DigitCount[i^2][[6]] != n, i++; ]; i]; (* Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 20 2006 *)
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CROSSREFS
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Cf. A036512, A034986, A048351.
Sequence in context: A266570 A156703 A285452 * A030991 A216093 A151752
Adjacent sequences: A048347 A048348 A048349 * A048351 A048352 A048353
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KEYWORD
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nonn,base,more
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AUTHOR
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Patrick De Geest, Mar 15 1999
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EXTENSIONS
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More terms from Jon E. Schoenfield, Jan 14 2009
One more term from Jon E. Schoenfield, Jan 25 2009
a(17)-a(19) from Giovanni Resta, Jul 27 2018
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STATUS
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approved
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