id:A047824 - OEIS Search Results

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Becomes prime after exactly 5 iterations of f(x) = sum of prime factors of x.

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134, 177, 262, 268, 398, 422, 466, 524, 531, 536, 573, 614, 669, 706, 742, 753, 796, 817, 818, 844, 849, 898, 915, 921, 932, 933, 934, 974, 1006, 1048, 1072, 1149, 1165, 1202, 1222, 1227, 1228, 1238, 1239, 1243, 1294, 1322, 1347, 1354, 1385, 1393, 1398 (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: A055579 A061491 A048128 this_sequence A020353 A050963 A051387` `Adjacent sequences: A047821 A047822 A047823 this_sequence A047825 A047826 A047827`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified July 8 18:40 EDT 2008. Contains 141013 sequences.

AT&T Labs Research