id:A067536 - OEIS Search Results

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Numbers n such that phi(n*(n+1)*(n+2)/3)/phi(n) is not an integer where phi(n) is the Euler totient function A000010(n).

+0
1

9, 45, 81, 99, 135, 225, 234, 261, 288, 351, 423, 450, 459, 477, 504, 567, 585, 639, 666, 819, 837, 855, 900, 927, 954, 981, 1017, 1134, 1179, 1242, 1305, 1359, 1431, 1449, 1485, 1521, 1593, 1638, 1710, 1773, 1908, 1953, 1971, 2025, 2061, 2097, 2151 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For every n, a(n)==0 (mod 3).`
	CROSSREFS	`Sequence in context: A006886 A053816 A044492 this_sequence A139609 A068314 A152996` `Adjacent sequences: A067533 A067534 A067535 this_sequence A067537 A067538 A067539`
	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.

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