A076353 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).

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

Offset

1,1

Links

Table of n, a(n) for n=1..51.

Prog

(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)

Crossrefs

Sequence in context: A226607 A284495 A160077 * A297575 A093020 A105504

Adjacent sequences: A076350 A076351 A076352 * A076354 A076355 A076356

Keyword

base,nonn

Author

Benoit Cloitre, Aug 30 2003

Extensions

Corrected and extended by Lambert Klasen (lambert.klasen(AT)gmx.de), Jan 19 2005

Status

approved