id:A048131 - OEIS Search Results

Search: id:A048131

Displaying 1-1 of 1 results found.

page 1

Becomes prime or 4 after exactly 9 iterations of f(x) = sum of prime factors of x.

+0
1

4659, 5294, 5937, 9286, 10334, 10843, 15490, 16382, 17972, 18201, 18588, 18735, 19137, 19984, 20059, 22482, 23073, 23806, 25405, 26405, 26547, 27622, 27845, 28694, 28772, 30062, 30486, 31686, 32156, 32313, 33177, 33238, 33414, 33944 (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: A069646 A159220 A020422 this_sequence A062626 A066731 A022244` `Adjacent sequences: A048128 A048129 A048130 this_sequence A048132 A048133 A048134`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

page 1

Search completed in 0.002 seconds

Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research