id:A078443 - OEIS Search Results

Search: id:A078443

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Numbers which are both interprime and semiprime.

+0
2

4, 6, 9, 15, 21, 26, 34, 39, 69, 86, 93, 111, 129, 134, 205, 217, 254, 274, 309, 334, 381, 386, 393, 446, 453, 473, 489, 501, 515, 566, 667, 687, 723, 771, 803, 879, 933, 939, 974, 1003, 1011, 1126, 1167, 1207, 1226, 1234, 1243, 1286, 1294, 1299, 1313, 1465 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a[8]=39 because 39=(37+41)/2 and 39=3*13`
	CROSSREFS	`Cf. A024675, A001358.` `Sequence in context: A020706 A137371 A086697 this_sequence A085751 A116589 A118688` `Adjacent sequences: A078440 A078441 A078442 this_sequence A078444 A078445 A078446`
	KEYWORD	`nonn`
	AUTHOR	`Lior Manor (lior.manor(AT)gmail.com) Dec 31 2002`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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