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A046519 Least n-digit 'happy' prime. 3


%S 7,13,103,1009,10009,100003,1000003,10000121,100000039,1000000009,

%T 10000000033,100000000003,1000000000039,10000000000411,

%U 100000000000067,1000000000000487,10000000000000481,100000000000000003

%N Least n-digit 'happy' prime.

%C Values found by Harvey Heinz and _Jud McCranie_.

%D R. K. Guy, Unsolved Problems Number Theory, Sect. E34.

%H Bo Gyu Jeong, <a href="/A046519/b046519.txt">Table of n, a(n) for n = 1..50</a>

%H C. Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_021.htm">Related puzzle page</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HappyNumber.html">Happy Number</a>

%Y Cf. A007770, A035497.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Sep 15 1998

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Last modified May 15 13:52 EDT 2021. Contains 343920 sequences. (Running on oeis4.)