A135623 Mersenne primes written backwards.

3, 7, 13, 721, 1918, 170131, 782425, 7463847412, 1593963129003485032, 111265944731096246910079816, 721882010875193363312928672952261, 727501488517303786137132964064381141071

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..18

Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

Example

a(3)=13 because the 3rd Mersenne prime is 31.

Mathematica

IntegerReverse[2^MersennePrimeExponent[Range[15]]-1] (* Harvey P. Dale, Feb 26 2023 *)

Crossrefs

Cf. A000668, A004087.

Sequence in context: A154821 A353008 A084741 * A172291 A343589 A089305

Adjacent sequences: A135620 A135621 A135622 * A135624 A135625 A135626

Keyword

base,easy,nonn

Author

Omar E. Pol, Feb 17 2008

Status

approved