id:A118691 - OEIS Search Results

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Semiprimes for which the digital root is also a semiprime.

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4, 6, 9, 15, 22, 33, 49, 51, 58, 69, 85, 87, 94, 121, 123, 141, 159, 166, 177, 202, 213, 247, 249, 265, 267, 274, 301, 303, 319, 321, 339, 346, 355, 382, 391, 393, 411, 427, 445, 447, 454, 481, 501, 517, 519, 526, 535, 537, 553, 562, 573, 589, 591, 634, 679 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`87 is in the sequence because (1) it is a semiprime and (2) the digital root 6 is also a semiprime.`
	CROSSREFS	`Cf. A001358.` `Sequence in context: A085751 A116589 A118688 this_sequence A087718 A033476 A118696` `Adjacent sequences: A118688 A118689 A118690 this_sequence A118692 A118693 A118694`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), May 20 2006`

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Last modified March 19 01:26 EDT 2010. Contains 173632 sequences.

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