The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A277810 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. 5
 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 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Permutation of squarefree numbers (A005117) after their initial term 1. LINKS FORMULA A(r,c) = A019565(A277820(r,c)). EXAMPLE 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 PROG (Scheme) (define (A277810 n) (A277810bi (A002260 n) (A004736 n))) (define (A277810bi row col) (A019565 (A277820bi row col))) CROSSREFS 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 KEYWORD nonn,tabl AUTHOR Antti Karttunen, Nov 01 2016 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 4 22:05 EST 2023. Contains 360082 sequences. (Running on oeis4.)