id:A066260 - OEIS Search Results

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In the prime factorization of n replace the k-th prime by the k-th composite number, k > 0.

+0
3

1, 4, 6, 16, 8, 24, 9, 64, 36, 32, 10, 96, 12, 36, 48, 256, 14, 144, 15, 128, 54, 40, 16, 384, 64, 48, 216, 144, 18, 192, 20, 1024, 60, 56, 72, 576, 21, 60, 72, 512, 22, 216, 24, 160, 288, 64, 25, 1536, 81, 256, 84, 192, 26, 864, 80, 576, 90, 72, 27, 768, 28, 80, 324 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Multiplicative with a(p) = A002808(A049084(p)), p prime.`
	EXAMPLE	`a(10) = a(25) = a(prime(1)prime(3)) = a(prime(1))a(prime(3)) = comp(1)comp(3) = 4 * 8 = 32.`
	CROSSREFS	`Cf. A066261, A066262.` `Sequence in context: A064910 A086714 A009463 this_sequence A123667 A129597 A088843` `Adjacent sequences: A066257 A066258 A066259 this_sequence A066261 A066262 A066263`
	KEYWORD	`mult,nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Dec 10 2001`

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Last modified August 8 15:51 EDT 2008. Contains 142751 sequences.

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