id:A056538 - OEIS Search Results

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Replace n by its divisors in reverse order.

+0
6

1, 2, 1, 3, 1, 4, 2, 1, 5, 1, 6, 3, 2, 1, 7, 1, 8, 4, 2, 1, 9, 3, 1, 10, 5, 2, 1, 11, 1, 12, 6, 4, 3, 2, 1, 13, 1, 14, 7, 2, 1, 15, 5, 3, 1, 16, 8, 4, 2, 1, 17, 1, 18, 9, 6, 3, 2, 1, 19, 1, 20, 10, 5, 4, 2, 1, 21, 7, 3, 1, 22, 11, 2, 1, 23, 1, 24, 12, 8, 6, 4, 3, 2, 1, 25, 5, 1, 26, 13, 2, 1, 27, 9 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`This gives the second elements of the ordered pairs (a,b) a >= 1, b >= 1 ordered by their product ab.`
	MAPLE	`map(op, [seq(reverse(sort(divisors(j))), j=1..30)]);` `cdr := proc(l) if 0 = nops(l) then ([]) else (l[2..nops(l)]): fi: end:` `reverse := proc(l) if 0 = nops(l) then ([]) else [op(reverse(cdr(l))), l[1]]; fi: end:`
	PROGRAM	`(MAGMA) [Reverse(Divisors(n)) : n in [1..30]];`
	CROSSREFS	`Cf. A027750 for the first elements, A056534.` `a(n) = A064894(A064896(n))` `Sequence in context: A087114 A088242 A113398 this_sequence A120385 A132460 A067734` `Adjacent sequences: A056535 A056536 A056537 this_sequence A056539 A056540 A056541`
	KEYWORD	`nonn,tabf`
	AUTHOR	`Antti Karttunen Jun 20, 2000`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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