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A161835 Numbers k whose largest divisor <= sqrt(k) is 5. 24

%I #12 Aug 27 2022 20:04:59

%S 25,30,35,40,45,50,55,65,75,85,95,115,125,145,155,185,205,215,235,265,

%T 295,305,335,355,365,395,415,445,485,505,515,535,545,565,635,655,685,

%U 695,745,755,785,815,835,865,895,905,955,965,985,995,1055,1115,1135,1145,1165,1195

%N Numbers k whose largest divisor <= sqrt(k) is 5.

%C See A161344 for more information. - _Omar E. Pol_, Jul 05 2009

%F Numbers k such that A033676(k)=5. - _Omar E. Pol_, Jul 05 2009

%t Select[Range[1, 1000], Function[m, Max[Select[Divisors[m], # <= Sqrt[m] &]] == 4]] (* _Ashton Baker_, Nov 03 2013 *)

%o (PARI) is(n)=divisors(n)[(numdiv(n)+1)\2]==5 \\ - _M. F. Hasler_, Nov 03 2013

%Y Cf. A033676, A008578, A161344, A161345, A161424, A161835, A162526, A162527, A162528, A162529, A162530, A162531, A162532.

%K easy,nonn

%O 1,1

%A _Omar E. Pol_, Jun 20 2009

%E Definition and more terms added by _R. J. Mathar_, Jun 28 2009

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Last modified April 25 08:27 EDT 2024. Contains 371964 sequences. (Running on oeis4.)