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A165995
a(n) = Sum_{p > n} floor(n^2/p), for primes p.
1
0, 1, 2, 7, 9, 16, 19, 28, 40, 54, 60, 76, 81, 100, 121, 143, 151, 177, 184, 210, 241, 272, 281, 314, 349, 386, 424, 465, 480, 522, 538, 582, 628, 677, 728, 782, 800, 856, 910, 970, 991, 1051, 1072, 1133, 1198, 1263, 1285, 1353, 1424, 1497, 1571
OFFSET
1,3
COMMENTS
Also the number of integers between n and n^2 with a prime factor > n. - Orson R. L. Peters, Dec 04 2017
LINKS
MATHEMATICA
Block[{nn = 51, s}, s = Array[FactorInteger[#][[All, 1]] &, nn^2]; Table[Count[s[[#]] & /@ Range[n, n^2], _?(AnyTrue[#, # > n &] &)], {n, nn}]] (* Michael De Vlieger, Dec 04 2017 *)
CROSSREFS
Cf. A165974.
Sequence in context: A225675 A185869 A020894 * A287575 A267212 A022113
KEYWORD
nonn
AUTHOR
EXTENSIONS
Definition corrected by Orson R. L. Peters, Dec 04 2017
STATUS
approved