id:A053093 - OEIS Search Results

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Smallest composite which when sum of prime factors is repeatedly subtracted reaches a prime after n iterations.

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8, 16, 27, 58, 104, 150, 186, 256, 324, 378, 576, 636, 805, 1470, 1520, 1564, 1612, 3478, 3864, 8022, 9996, 10548, 11573, 11946, 12006, 13587, 13640, 15156, 20504, 21204, 21252, 24017, 24080, 25823, 27989, 30067, 30866, 31165, 31212, 47628 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(5)=104. Iteration 1: 104=22213 and sum of factors is 19; 104-19=85. Iteration 2: 85=517; 85-22=63. Iterations 3,4,5 produce 63-13=50, 50-12=38 and 38-21=17, a prime.`
	CROSSREFS	`A050710, A053094.` `Sequence in context: A111307 A076405 A099997 this_sequence A039288 A045237 A047925` `Adjacent sequences: A053090 A053091 A053092 this_sequence A053094 A053095 A053096`
	KEYWORD	`nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net), Feb 28 2000`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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