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A035065 n! has a prime number of digits. 2
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; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..57.

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.

Sequence in context: A274918 A277736 A287358 * A209722 A035067 A027698

Adjacent sequences:  A035062 A035063 A035064 * A035066 A035067 A035068

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Nov 15 1998.

STATUS

approved

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Last modified January 22 22:37 EST 2018. Contains 298093 sequences.