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A070694 Numbers n such that n+1, n^2+1, n^4+1, n^8+1 and n^16+1 are primes. 4
1, 2, 337536, 585106, 602056, 2071960, 11861410, 20706120, 54020170, 72696726, 87584646, 89445636, 95895930, 98583340, 98595070, 112204200, 205739220, 279448296, 292582836, 337969690, 349672456, 432972780, 437874186, 474186576, 479631880, 483333426, 621777466, 643697776 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The first term such that n^32+1 is also a prime is 7072833120. - Alex Ratushnyak, Jan 02 2014

LINKS

Table of n, a(n) for n=1..28.

MATHEMATICA

Do[ If[ PrimeQ[n + 1] && PrimeQ[n^2 + 1] && PrimeQ[n^4 + 1] && PrimeQ[n^8 + 1] && PrimeQ[n^16 + 1], Print[n]], {n, 1, 10^7}]

CROSSREFS

Sequence in context: A058435 A151606 A176939 * A322095 A158346 A018854

Adjacent sequences:  A070691 A070692 A070693 * A070695 A070696 A070697

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, May 13 2002

EXTENSIONS

a(7)-a(24) from Donovan Johnson, Dec 02 2009

a(25)-a(28) from Alex Ratushnyak, Jan 02 2014

STATUS

approved

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Last modified October 17 08:36 EDT 2019. Contains 328107 sequences. (Running on oeis4.)