id:A067544 - OEIS Search Results

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Numbers n such that phi(n*(n+1)*(n+2)/6)/phi(n*(n+1)/2) is not an integer where phi(n)=A000010(n) is the Euler totient function.

+0
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8, 9, 18, 27, 44, 45, 53, 62, 80, 81, 90, 98, 99, 108, 116, 126, 134, 135, 143, 162, 171, 189, 198, 224, 225, 233, 234, 251, 260, 261, 270, 279, 287, 288, 296, 315, 332, 350, 351, 387, 413, 422, 423, 441, 449, 450, 458, 459, 468, 476, 477, 503, 504, 512, 522 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Often a(k)==0 (mod 3) and if a(k+1)-a(k)=1 then a(k+1)==0 (mod 3)`
	CROSSREFS	`Sequence in context: A050706 A159836 A069809 this_sequence A022313 A120311 A061414` `Adjacent sequences: A067541 A067542 A067543 this_sequence A067545 A067546 A067547`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 28 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research