id:A047825 - OEIS Search Results

Search: id:A047825

Displaying 1-1 of 1 results found.

page 1

Becomes prime after exactly 6 iterations of f(x) = sum of prime factors of x.

+0
1

393, 889, 1142, 1179, 1257, 1270, 1285, 1315, 1389, 1502, 1542, 1563, 1578, 1838, 2217, 2284, 2305, 2326, 2474, 2540, 2761, 2766, 2787, 2827, 2913, 3004, 3084, 3156, 3193, 3207, 3505, 3507, 3537, 3589, 3676, 3771, 3826, 3873, 3957, 4006, 4167, 4195 (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: A105210 A158002 A083752 this_sequence A051986 A126078 A028299` `Adjacent sequences: A047822 A047823 A047824 this_sequence A047826 A047827 A047828`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

page 1

Search completed in 0.002 seconds

Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

AT&T Labs Research