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A117811 Two-column table read by rows: row n (n >= 1) gives a squarefree integer x and an integer y such that n = x*y^2. 2
1, 1, 2, 1, 3, 1, 1, 2, 5, 1, 6, 1, 7, 1, 2, 2, 1, 3, 10, 1, 11, 1, 3, 2, 13, 1, 14, 1, 15, 1, 1, 4, 17, 1, 2, 3, 19, 1, 5, 2, 21, 1, 22, 1, 23, 1, 6, 2, 1, 5, 26, 1, 3, 3, 7, 2, 29, 1, 30, 1, 31, 1, 2, 4, 33, 1, 34, 1, 35, 1, 1, 6, 37, 1, 38, 1, 39, 1, 10, 2, 41, 1, 42, 1, 43, 1, 11 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..87.

EXAMPLE

Table begins:

1 1

2 1

3 1

1 2 (so 4 = 1*2^2)

5 1

6 1

7 1

2 2 (so 8 = 2*2^2)

1 3

10 1

11 1

3 2

13 1

14 1

15 1

1 4

PROG

(MAGMA) at:=0; for n in [1..100] do print Squarefree(n); end for;

CROSSREFS

The two columns are A007913, A000188.

Sequence in context: A206437 A296085 A007740 * A297381 A051793 A065371

Adjacent sequences:  A117808 A117809 A117810 * A117812 A117813 A117814

KEYWORD

nonn,tabf

AUTHOR

N. J. A. Sloane, Dec 23 2006

STATUS

approved

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Last modified March 19 18:49 EDT 2019. Contains 321330 sequences. (Running on oeis4.)