A063485 Composites of the form 2^(2^k)+3.

259, 4294967299, 18446744073709551619, 340282366920938463463374607431768211459, 115792089237316195423570985008687907853269984665640564039457584007913129639939

Offset

1,1

References

D. M. Burton, Elementary Number Theory, Allyn and Bacon, Inc., Boston, MA, 1976, p. 238.

Links

Harry J. Smith, Table of n, a(n) for n = 1..8

Prog

(PARI) for(n=0, 8, my(x=(2^(2^n)+3)); if(!isprime(x), print1(x, ", ")))

Crossrefs

Sequence in context: A022221 A121918 A097735 * A252248 A214471 A344238

Adjacent sequences: A063482 A063483 A063484 * A063486 A063487 A063488

Keyword

nonn

Author

Jason Earls, Jul 28 2001

Extensions

Offset changed by Andrew Howroyd, Sep 18 2024

Status

approved