

A181576


Primes whose factorials end with a prime number of trailing 0's.


1



11, 13, 17, 19, 31, 59, 83, 127, 151, 173, 179, 197, 199, 223, 293, 367, 397, 421, 439, 449, 461, 463, 557, 569, 607, 617, 619, 631, 659, 733, 773, 797, 853, 919, 941, 967, 1013, 1039, 1061, 1063, 1087, 1097, 1123, 1181, 1259, 1399, 1423, 1447, 1543, 1567
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OFFSET

1,1


COMMENTS

For the corresponding prime number of trailing end 0's, see A181577.


LINKS

Table of n, a(n) for n=1..50.


EXAMPLE

The factorial 2!=2 ends with 0 zeros, so the prime 2 is not in the sequence because 0 is not a prime.
The factorial 5!=120 ends with 1 zero, so the prime 5 is not in the sequence because 1 is not a prime.
The factorial 11!=39916800 ends with 2 zeros, so the prime 11 is in the sequence because 2 is a prime.


MATHEMATICA

Select[ Prime@ Range@ 250, PrimeQ@ IntegerExponent[ #! ] &] (* Robert G. Wilson v, Nov 06 2010 *)


CROSSREFS

Cf. A039716.
Sequence in context: A208270 A106101 A032590 * A076162 A156902 A050674
Adjacent sequences: A181573 A181574 A181575 * A181577 A181578 A181579


KEYWORD

nonn,base


AUTHOR

Lekraj Beedassy, Nov 02 2010


EXTENSIONS

More terms from Robert G. Wilson v, Nov 06 2010


STATUS

approved



