id:A118692 - OEIS Search Results

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Semiprimes for which the multiplicative digital root is also a semiprime.

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4, 6, 9, 14, 22, 33, 39, 74, 82, 86, 91, 93, 119, 122, 123, 133, 141, 161, 213, 217, 218, 221, 249, 267, 289, 298, 319, 321, 346, 377, 382, 386, 391, 411, 417, 422, 437, 466, 471, 473, 478, 481, 489, 611, 626, 634, 662, 674, 679, 681, 697, 721, 734, 737, 746 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`39 is in the sequence because (1) it is a semiprime and (2) the multiplicative digital root 4 is also a semiprime.`
	CROSSREFS	`Cf. A001358.` `Sequence in context: A057988 A073679 A118689 this_sequence A020706 A137371 A086697` `Adjacent sequences: A118689 A118690 A118691 this_sequence A118693 A118694 A118695`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), May 20 2006`

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

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