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A096525 Primes of form n.0.n+1, where '.' represents concatenation. Or, primes of form 10^(k+1)*n + n + 1, where k is the number of digits in n. 2

%I #6 Dec 15 2017 17:36:44

%S 607,809,20021,36037,38039,42043,48049,50051,66067,72073,78079,96097,

%T 1280129,1400141,1500151,1520153,1880189,2120213,2160217,2180219,

%U 2720273,2960297,3000301,3180319,3300331,3360337,3600361,3660367

%N Primes of form n.0.n+1, where '.' represents concatenation. Or, primes of form 10^(k+1)*n + n + 1, where k is the number of digits in n.

%H Robert Israel, <a href="/A096525/b096525.txt">Table of n, a(n) for n = 1..10000</a>

%p select(isprime,[seq(x+1+x*10^(2+ilog10(x+1)),x=2..1000,2)]); # _Robert Israel_, Nov 13 2017

%Y Cf. A096524.

%K base,easy,nonn

%O 1,1

%A _Jason Earls_, Jun 23 2004

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Last modified April 26 03:15 EDT 2024. Contains 371989 sequences. (Running on oeis4.)