id:A047823 - OEIS Search Results

Search: id:A047823

Displaying 1-1 of 1 results found.

page 1

Becomes prime after exactly 4 iterations of f(x) = sum of prime factors of x.

+0
1

62, 69, 124, 133, 190, 194, 201, 206, 207, 213, 217, 219, 226, 235, 238, 248, 249, 254, 282, 286, 303, 309, 310, 314, 355, 380, 386, 388, 406, 411, 412, 426, 447, 451, 452, 458, 469, 476, 483, 489, 496, 505, 508, 553, 564, 572, 598, 602, 603, 606, 620, 621 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`f(x) = sum of prime factors without multiplicity, so that f(1500) = 2+3+5 = 10.`
	CROSSREFS	`Sequence in context: A024804 A025340 A048127 this_sequence A044997 A138172 A074772` `Adjacent sequences: A047820 A047821 A047822 this_sequence A047824 A047825 A047826`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

page 1

Search completed in 0.002 seconds

Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

AT&T Labs Research