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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A103901 Mersenne primes p such that M(p) = 2^p - 1 is also a (Mersenne) prime.

Original entry on oeis.org

3, 7, 31, 127
Offset: 1

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Author

Jonathan Sondow, Feb 20 2005

Keywords

Comments

Same as exponents of double Mersenne primes. Only four terms are known.

Examples

			2^2 - 1 = 3 and 2^3 - 1 = 7 are Mersenne primes, so 3 is a member.

References

  • R. K. Guy, Unsolved Problems in Number Theory, 3rd ed., Springer-Verlag, NY, 2004, Sec. A3.
  • G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers, 3rd ed., Oxford Univ. Press, 1954, p. 16.
  • P. Ribenboim, The New Book of Prime Number Records, Springer-Verlag, NY, 1996, Chap. 2, Sec. VII.

Links

Crossrefs

Cf. A000043, A000668, A001348, A077586, A103902.
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