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A065145 Smallest prime that begins with the n-th square in decimal notation. 2

%I #7 May 17 2018 05:31:12

%S 11,41,97,163,251,367,491,641,811,1009,1213,1447,1693,19603,2251,

%T 25601,2897,32401,3613,4001,44101,48407,5297,57601,6257,6761,7297,

%U 7841,8419,9001,9613,10243,10891,115601,12251,12967,13691,14447,15217,16001

%N Smallest prime that begins with the n-th square in decimal notation.

%H Robert Israel, <a href="/A065145/b065145.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = A030665(n^2). - _Robert Israel_, May 16 2018

%p f:= proc(n) local d,m,r;

%p for d from 1 do

%p for m from 1 to 10^d-1 by 2 do

%p r:= 10^d*n^2 + m;

%p if isprime(r) then return r fi

%p od od

%p end proc:

%p map(f, [$1..100]); # _Robert Israel_, May 16 2018

%Y Cf. A030665, A062584, A000290, A000040, A065144.

%K base,nonn

%O 1,1

%A _Reinhard Zumkeller_, Oct 17 2001

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Last modified April 25 07:53 EDT 2024. Contains 371964 sequences. (Running on oeis4.)