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 A322837 Number of positive integers less than n with fewer distinct prime factors than n. 3
 0, 1, 1, 1, 1, 5, 1, 1, 1, 8, 1, 9, 1, 10, 10, 1, 1, 12, 1, 13, 13, 13, 1, 14, 1, 15, 1, 16, 1, 29, 1, 1, 19, 19, 19, 19, 1, 20, 20, 20, 1, 40, 1, 22, 22, 22, 1, 23, 1, 24, 24, 24, 1, 25, 25, 25, 25, 25, 1, 57, 1, 27, 27, 1, 28, 62, 1, 29, 29, 65, 1, 30, 1, 31 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 LINKS EXAMPLE Column n lists the a(n) positive integers less than n with fewer distinct prime factors than n:   1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20   ---------------------------------------------------------------------      1  1  1  1  5  1  1  1  9   1   11  1   13  13  1   1   17  1   19                  4           8       9       11  11          16      17                  3           7       8       9   9           13      16                  2           5       7       8   8           11      13                  1           4       5       7   7           9       11                              3       4       5   5           8       9                              2       3       4   4           7       8                              1       2       3   3           5       7                                      1       2   2           4       5                                              1   1           3       4                                                              2       3                                                              1       2                                                                      1 MATHEMATICA Table[Length[Select[Range[n], PrimeNu[#]

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Last modified April 5 03:58 EDT 2020. Contains 333238 sequences. (Running on oeis4.)