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%I #7 Feb 26 2023 13:03:12
%S 3,7,13,721,1918,170131,782425,7463847412,1593963129003485032,
%T 111265944731096246910079816,721882010875193363312928672952261,
%U 727501488517303786137132964064381141071
%N Mersenne primes written backwards.
%H Harvey P. Dale, <a href="/A135623/b135623.txt">Table of n, a(n) for n = 1..18</a>
%H Omar E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica de los numeros primos y perfectos</a>.
%e a(3)=13 because the 3rd Mersenne prime is 31.
%t IntegerReverse[2^MersennePrimeExponent[Range[15]]-1] (* _Harvey P. Dale_, Feb 26 2023 *)
%Y Cf. A000668, A004087.
%K base,easy,nonn
%O 1,1
%A _Omar E. Pol_, Feb 17 2008
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