id:A035065 - OEIS Search Results

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n! has a prime number of digits.

+0
3

4, 5, 6, 8, 10, 14, 15, 20, 23, 27, 29, 33, 35, 39, 43, 51, 58, 68, 70, 84, 86, 89, 90, 95, 104, 107, 110, 111, 116, 117, 119, 120, 133, 134, 136, 139, 147, 150, 158, 159, 170, 183, 193, 199, 206, 211, 224, 229, 235, 239, 244, 249, 254, 270, 279, 282, 291, 299 (list; graph; listen)

	OFFSET	`0,1`
	LINKS	`Index entries for sequences related to factorial numbers`
	EXAMPLE	`a(1)=4 because 4! = 24 has 2 ( prime ) digits.` `23! = 25852016738884976640000 has exactly 23 digits !`
	MATHEMATICA	`Select[ Range[300], PrimeQ[ Floor[ Log[10, #! ] + 1]] & ]`
	CROSSREFS	`Cf. A000142, A035066, A067367.` `Adjacent sequences: A035062 A035063 A035064 this_sequence A035066 A035067 A035068` `Sequence in context: A087947 A053427 A037354 this_sequence A035067 A027698 A047313`
	KEYWORD	`nonn`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 1998.`

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Last modified May 14 01:44 EDT 2008. Contains 139663 sequences.

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