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A277810
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Square array A(r,c) = A019565(A277820(r,c)), read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.
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5
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2, 6, 3, 10, 15, 30, 210, 21, 14, 5, 22, 1155, 462, 35, 70, 858, 39, 910, 55, 330, 105, 1870, 3315, 72930, 5005, 2002, 33, 42, 9699690, 5187, 2926, 85, 714, 2145, 770, 7, 46, 111546435, 238602, 11305, 248710, 3927, 390, 77, 154, 4002, 87, 93763670, 21505, 152490, 440895, 3094, 91, 546, 231, 7130, 13485, 620310, 1078282205, 2306486, 9867, 114114, 17017, 170170, 1365, 2310
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OFFSET
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1,1
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COMMENTS
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Permutation of squarefree numbers (A005117) after their initial term 1.
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LINKS
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Antti Karttunen, Table of n, a(n) for n = 1..1540; the first 55 antidiagonals of the array
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FORMULA
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A(r,c) = A019565(A277820(r,c)).
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EXAMPLE
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The top left corner of the array:
2, 6, 10, 210, 22, 858, 1870, 9699690
3, 15, 21, 1155, 39, 3315, 5187, 111546435
30, 14, 462, 910, 72930, 2926, 238602, 93763670
5, 35, 55, 5005, 85, 11305, 21505, 1078282205
70, 330, 2002, 714, 248710, 152490, 2306486, 60138078
105, 33, 2145, 3927, 440895, 9867, 1870935, 691587897
42, 770, 390, 3094, 114114, 520030, 162690, 581334754
7, 77, 91, 17017, 133, 33649, 50141, 6685349671
154, 546, 170170, 570, 6118, 254562, 357505330, 51269790
231, 1365, 7293, 3135, 1312311, 983535, 11599797, 589602585
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PROG
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(Scheme)
(define (A277810 n) (A277810bi (A002260 n) (A004736 n)))
(define (A277810bi row col) (A019565 (A277820bi row col)))
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CROSSREFS
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Transpose: A277809.
The topmost row: A123098, the leftmost column: A277811.
Cf. A005117, A019565, A277820.
Sequence in context: A167979 A354930 A276578 * A180428 A130684 A295644
Adjacent sequences: A277807 A277808 A277809 * A277811 A277812 A277813
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KEYWORD
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nonn,tabl
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AUTHOR
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Antti Karttunen, Nov 01 2016
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STATUS
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approved
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