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A076353
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Numbers n such that sum(k=1,n,d(k)) is an integer, where d(k) is the decimal fraction 0.floor(sqrt(k)) (e.g. d(16)=0.4).
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0
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19, 24, 26, 28, 30, 32, 34, 49, 59, 67, 72, 77, 84, 94, 104, 114, 219, 226, 246, 342, 364, 455, 542, 690, 879, 903, 913, 923, 933, 943, 953, 1117, 1174, 1224, 1244, 1264, 1284, 1419, 1467, 1517, 1594, 1745, 1774, 1824, 1892, 2027, 2047, 2067, 2087, 2107, 2155
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..51.
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PROG
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(PARI) s=0; for(k=1, 5000, r=sqrtint(k)/10; while(r>=1, r=r/10); s+=r; if(denominator(s)==1, print1(k, ", "))) (Klasen)
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CROSSREFS
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Sequence in context: A226607 A284495 A160077 * A297575 A093020 A105504
Adjacent sequences: A076350 A076351 A076352 * A076354 A076355 A076356
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KEYWORD
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base,nonn
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AUTHOR
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Benoit Cloitre, Aug 30 2003
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EXTENSIONS
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Corrected and extended by Lambert Klasen (lambert.klasen(AT)gmx.de), Jan 19 2005
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STATUS
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approved
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