A135623 Mersenne primes written backwards.

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

Offset: 1

Author

Omar E. Pol, Feb 17 2008

Keywords

• base
• easy
• nonn

Examples

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

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..18
• Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

Crossrefs

Cf. A000668, A004087.

Programs

Mathematica

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