id:A048126 - OEIS Search Results

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

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26, 33, 39, 44, 49, 51, 55, 65, 66, 70, 77, 78, 84, 91, 92, 95, 98, 100, 105, 110, 112, 114, 119, 120, 125, 126, 128, 129, 130, 132, 135, 140, 143, 144, 150, 154, 156, 160, 162, 168, 170, 180, 189, 192, 196, 200, 204, 205, 216, 217, 220, 225, 240, 242, 243 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`f(x) = sum of prime factors with multiplicity, so that f(1500) = 2+2+3+5+5+5 = 22.`
	CROSSREFS	`Sequence in context: A050770 A050438 A047822 this_sequence A080932 A129914 A106794` `Adjacent sequences: A048123 A048124 A048125 this_sequence A048127 A048128 A048129`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified December 3 22:15 EST 2009. Contains 170310 sequences.

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