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A070173
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n! and 2^n+1 are relatively primes.
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0
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1, 2, 4, 8, 12, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 128, 136, 144, 152, 160, 176, 184, 192, 200, 208, 224, 232, 248, 256, 272, 288, 304, 320, 352, 368, 384, 400, 416, 448, 464, 480, 496, 512, 544, 576, 592, 608, 640, 656, 688, 704, 752, 768
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MATHEMATICA
| Select[Range[1000], CoprimeQ[#!, 2^#+1]&]
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PROG
| (PARI) for(n=1, 1255, if(gcd(n!, 2^n+1)==1, print1(n, ", ")))
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CROSSREFS
| Cf. A069180.
Sequence in context: A187208 A047836 A181824 * A116882 A069519 A087980
Adjacent sequences: A070170 A070171 A070172 * A070174 A070175 A070176
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KEYWORD
| easy,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), May 06 2002
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