

A120533


Primes having a prime number of digits.


1



11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283
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OFFSET

1,1


COMMENTS

Before the 20th century, this sequence would have contained the numbers 1,2,3,5,7; see A008578.


LINKS

Table of n, a(n) for n=1..57.


EXAMPLE

10007 is a 5digit prime and so belongs to the sequence.


PROG

(PARI) g(n) = forprime(x=11, n, if(isprime(length(Str(x))), print1(x", ")))
(PARI) forprime(p=2, 5, forprime(q=10^(p1), 10^p, print1(q", "))) \\ Charles R Greathouse IV, Oct 04 2011


CROSSREFS

Cf. A000040, A124888.
Sequence in context: A096489 A008364 A140461 * A226108 A095862 A125845
Adjacent sequences: A120530 A120531 A120532 * A120534 A120535 A120536


KEYWORD

base,nonn


AUTHOR

Cino Hilliard, Aug 06 2006


EXTENSIONS

Edited by N. J. A. Sloane at the suggestion of Andrew Plewe, May 21 2007


STATUS

approved



