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Smallest n-th power whose decimal expansion starts with 7.
3

%I #7 Mar 20 2015 18:55:27

%S 7,729,729,707281,7776,729,78125,78310985281,794280046581,

%T 79792266297612001,743008370688,7355827511386641,793714773254144,

%U 78364164096,734461618571137961752599,79766443076872509863361

%N Smallest n-th power whose decimal expansion starts with 7.

%C Terms from _Robert G. Wilson v_.

%t a = {}; Do[k = 1; While[First[IntegerDigits[k^n]] != 7, k++ ]; a = Append[a, k^n], {n, 1, 25}]; a (* _Robert G. Wilson v_ *)

%Y Cf. A067442, A067443, A067444, A067445, A067446, A067447.

%K base,easy,nonn

%O 1,1

%A _Amarnath Murthy_, Feb 05 2002