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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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FORMULA
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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 (A277810bi row col) (A019565 (A277820bi row col)))
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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