id:A051676 - OEIS Search Results

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Composite numbers n such that the number of divisors of n^2 is a prime.

+0
1

4, 8, 9, 25, 27, 32, 49, 64, 121, 125, 169, 243, 256, 289, 343, 361, 512, 529, 729, 841, 961, 1331, 1369, 1681, 1849, 2048, 2197, 2209, 2809, 3125, 3481, 3721, 4489, 4913, 5041, 5329, 6241, 6561, 6859, 6889, 7921, 9409 (list; graph; listen)

	OFFSET	`0,1`
	MATHEMATICA	`Select[Range[10^4], ! PrimeQ[ # ] && PrimeQ[DivisorSigma[0, #^2]] &]`
	CROSSREFS	`Sequence in context: A063907 A056166 A093771 this_sequence A114129 A053810 A076702` `Adjacent sequences: A051673 A051674 A051675 this_sequence A051677 A051678 A051679`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 15 2001`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

AT&T Labs Research