id:A061806 - OEIS Search Results

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Numbers n such that the iterative cycle: n -> sum of digits of n^2 has only three distinct elements.

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4, 5, 17, 26, 28, 32, 37, 40, 43, 44, 49, 50, 53, 62, 63, 64, 67, 73, 74, 76, 77, 82, 83, 86, 87, 88, 89, 91, 92, 93, 94, 97, 98, 107, 109, 113, 114, 116, 117, 118, 122, 124, 125, 126, 127, 128, 133, 137, 141, 143, 149, 154, 157, 158, 161, 164, 166, 167, 169, 170 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`4 -> 1+6 = 7 -> 4+9 = 13 -> 1+6+9 = 16 -> 2+5+6 = 13, thus {7,13,16} are the only distinct elements of the iterative cycle of 4.`
	CROSSREFS	`Cf. A007953, A004159, A061903 - A061910.` `Sequence in context: A045680 A026678 A026869 this_sequence A119997 A010361 A060289` `Adjacent sequences: A061803 A061804 A061805 this_sequence A061807 A061808 A061809`
	KEYWORD	`nonn,base`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu), May 17 2001`

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Last modified December 2 15:58 EST 2008. Contains 150992 sequences.

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