id:A064518 - OEIS Search Results

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For an integer n with prime factorization p_1*p_2*p_3* ... *p_m let n* =(p_1+1)*(p_2+1)*(p_3+1)* ... *(p_m+1); sequence gives n* such that n* is divisible by n.

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1, 12, 36, 144, 432, 1296, 1728, 5184, 15552, 20736, 46656, 62208, 186624, 248832, 559872, 746496, 1679616, 2239488, 2985984, 6718464, 8957952, 20155392, 26873856, 60466176, 35831808, 80621568, 107495424, 241864704, 322486272 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`It is not difficult to show that these numbers have the form a(n) =3^i*4^j with j <= i <= 2j.`
	CROSSREFS	`Every term is also a term of A064476.` `Sequence in context: A058880 A055551 A073403 this_sequence A135178 A085331 A058040` `Adjacent sequences: A064515 A064516 A064517 this_sequence A064519 A064520 A064521`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Oct 07 2001`

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Last modified September 7 12:28 EDT 2008. Contains 143483 sequences.

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