A272616 - OEIS

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A272616

Rectangular array, r(n,k), by antidiagonals: the interspersion associated with the fractal sequence A249727.

1, 2, 3, 4, 5, 8, 6, 7, 11, 15, 9, 10, 14, 19, 32, 12, 13, 18, 23, 37, 43, 16, 17, 22, 27, 42, 49, 68, 20, 21, 26, 31, 48, 55, 75, 83, 24, 25, 30, 36, 54, 61, 82, 91, 116, 28, 29, 35, 41, 60, 67, 90, 99, 125, 171, 33, 34, 40, 47, 66, 74, 98, 107, 134, 181

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

r(n,k) is the position of the k-th occurrence of n in A249727. Every positive integer occurs exactly once, and each row is interspersed by each other row, except for initial terms.

LINKS

Table of n, a(n) for n=1..65.

EXAMPLE

Northwest corner:

1 2 4 6 9 12 16 20

3 5 7 10 13 17 21 25

8 11 14 18 22 26 30 35

15 19 23 27 31 36 41 47

32 37 42 48 54 60 66 73

43 49 55 61 67 74 81 89

MATHEMATICA

t = Flatten[Table[Range[PrimePi[n]], {n, 2, 200}]];