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 A063485 Composites of the form 2^(2^n)+3. 1
 259, 4294967299, 18446744073709551619, 340282366920938463463374607431768211459, 115792089237316195423570985008687907853269984665640564039457584007913129639939 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 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=0,...,7 PROG (PARI) for(n=0, 8, x=(2^(2^n)+3); if(isprime(x), n+1, print(x))) (PARI) { n=-1; for (m=0, 10^9, if (!isprime(a=(2^(2^m) + 3)), write("b063485.txt", n++, " ", a); if (n==7, break)) ) } \\ Harry J. Smith, Aug 23 2009 CROSSREFS Sequence in context: A022221 A121918 A097735 * A252248 A214471 A139408 Adjacent sequences:  A063482 A063483 A063484 * A063486 A063487 A063488 KEYWORD nonn AUTHOR Jason Earls, Jul 28 2001 STATUS approved

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Last modified April 21 20:03 EDT 2019. Contains 322328 sequences. (Running on oeis4.)