

A067522


Smallest prime with sum of digits = 2^n.


0



2, 13, 17, 79, 6899, 19999999, 399899999999999, 59998999999999999999999999999, 999999999998999999999999999999999999999999999999999999999, 899999999999999999999999999999998999999999999999999999999999999999999999999999999999999999999999999999999999999999
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OFFSET

1,1


COMMENTS

The new terms are probable primes.  Joshua Zucker, May 08 2006
According to the Magma Calculator (http://magma.maths.usyd.edu.au/calc/), all terms through a(10) are prime.  Jon E. Schoenfield, Aug 24 2009


LINKS

Table of n, a(n) for n=1..10.


EXAMPLE

a(5) = 6899 which is the smallest prime with 6+8+9+9 = 32 = 2^5.


CROSSREFS

Sequence in context: A122487 A109181 A175448 * A128852 A191765 A063615
Adjacent sequences: A067519 A067520 A067521 * A067523 A067524 A067525


KEYWORD

base,easy,nonn


AUTHOR

Amarnath Murthy, Feb 14 2002


EXTENSIONS

a(6) and a(7) found by Shyam Sunder Gupta, Feb 17 2002
More terms from Joshua Zucker, May 08 2006
Edited by T. D. Noe, Oct 30 2008


STATUS

approved



