id:A087471 - OEIS Search Results

Search: id:A087471

Displaying 1-1 of 1 results found.

page 1

Final digit resulting from iterations of the product of the two numbers formed from the alternating digits of n.

+0
5

1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 2, 4, 6, 8, 0, 2, 4, 6, 8, 0, 3, 6, 9, 2, 5, 8, 2, 8, 4, 0, 4, 8, 2, 6, 0, 8, 6, 6, 8, 0, 5, 0, 5, 0, 0, 0, 5, 0, 0, 0, 6, 2, 8, 8, 0, 8, 8, 6, 0, 0, 7, 4, 2, 6, 5, 8, 8, 0, 8, 0, 8, 6, 8, 6, 0, 6, 0, 8, 4, 0, 9, 8, 4, 8, 0, 0, 8, 4, 8, 0, 0, 0, 0, 0, 0 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A087472(n) gives the number of iterations required for Murthy's function, f(n), to reach a single digit. A087473(n) gives the smallest number that requires n iterations of Murthy's function to reach a single digit. The n-th row of triangle A087474 gives the n successive iterations of Murthy's function on A087473(n).`
	FORMULA	`a(n) = a(f(n)), where f(n) is Murthy's function: f(1234)=1324=312, f(12345)=13524=3240, f(123456)=135*246=33210.`
	EXAMPLE	`a(1234) = a(1324) = a(312) = a(321) = a(32) = a(3*2) = 6.`
	CROSSREFS	`Cf. A087472, A087473, A087474.` `Adjacent sequences: A087468 A087469 A087470 this_sequence A087472 A087473 A087474` `Sequence in context: A010879 A062078 A031347 this_sequence A128212 A007954 A079475`
	KEYWORD	`nonn,base`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com) and Paul D. Hanna (pauldhanna(AT)juno.com), Sep 11 2003`

page 1

Search completed in 0.002 seconds

Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.

AT&T Labs Research