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%I #11 Jun 16 2016 17:59:21
%S 23,47,61,227,281,283,347,443,449,467,487,647,683,743,769,773,797,821,
%T 823,829,863,887,967,977,1123,1213,1231,1283,1289,1321,1471,1481,1487,
%U 1489,1627,1697,1741,1783,1823,1847,1861,1873,2113,2131,2237,2243,2267,2273,2281,2287,2311
%N Primes whose multiplicative digital root is 6.
%C Complement of A201020 with respect to A034053.
%H Harvey P. Dale, <a href="/A201019/b201019.txt">Table of n, a(n) for n = 1..1000</a>
%e Prime 227 is in sequence because 2*2*7=28, 2*8=16, 1*6=6.
%t dr6Q[n_]:=NestWhile[Times@@IntegerDigits[#]&,n,#>9&]==6; Select[ Prime[ Range[ 400]],dr6Q] (* _Harvey P. Dale_, Jun 16 2016 *)
%Y Cf. A201020 (composite numbers whose multiplicative digital root is 6), A034053 (numbers whose multiplicative digital root is 6).
%K nonn,base
%O 1,1
%A _Jaroslav Krizek_, Nov 25 2011
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