id:A060301 - OEIS Search Results

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For n>3: a(n) is a multiple of three distinct earlier terms.

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2, 3, 5, 30, 180, 300, 450, 1080, 1800, 2700, 3000, 4500, 6480, 6750, 10800, 16200, 18000, 27000, 30000, 38880, 40500, 45000, 64800, 67500, 97200, 101250, 108000, 162000, 180000, 233280, 243000, 270000, 300000, 388800, 405000, 450000, 583200 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) is of the form 2^b3^c5^d where either b+c+d=1, or where each of b, c and d are positive and the largest of the three is an odd number less than the sum of the other two. For n>3: a(n) is 30 times a power of 6 times a power of 10 times a power of 15.`
	EXAMPLE	`a(15)=10800=230180=a(1)a(4)a(5)`
	CROSSREFS	`Cf. A000423.` `Adjacent sequences: A060298 A060299 A060300 this_sequence A060302 A060303 A060304` `Sequence in context: A110389 A083388 A090475 this_sequence A040119 A106308 A036797`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Mar 28 2001`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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