A067522 Smallest prime with sum of digits = 2^n.

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

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