This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A068807 Primes whose sum of digits is a power of 2. 3

%I

%S 2,11,13,17,31,53,71,79,97,101,103,107,211,233,251,277,349,367,431,

%T 439,457,503,521,547,619,673,691,701,709,727,853,907,1021,1061,1069,

%U 1087,1151,1201,1223,1249,1429,1447,1483,1511,1601,1609,1627,1663,1753,1861,1933,1951,2011,2141

%N Primes whose sum of digits is a power of 2.

%C Subsequence of primes of A028838. - _Michel Marcus_, Aug 19 2015

%H Aaron Toponce, <a href="/A068807/b068807.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[ Prime@Range[ 300 ],IntegerQ[ Log[ 2,Plus@@IntegerDigits[ # ] ] ]& ] (* _Ray Chandler_, Dec 03 2009 *)

%o (MAGMA) [p: p in PrimesUpTo(2200) | PrimeDivisors(s) eq [2] where s is &+Intseq(p)]; // _Bruno Berselli_, Dec 26 2012

%o (PARI) lista(nn) = forprime (n=1, nn, sd = sumdigits(n); if (2^valuation(sd,2) == sd, print1(n, ", "))); \\ _Michel Marcus_, Aug 19 2015

%Y Different from A178796.

%K base,easy,nonn

%O 1,1

%A _Amarnath Murthy_, Mar 06 2002

%E Extended by _Ray Chandler_, Dec 03 2009

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 26 13:05 EDT 2019. Contains 323586 sequences. (Running on oeis4.)