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Search: id:A123200
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| A123200 |
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Numbers n such that 1000000*n-1 and 1000000*n+1 are twin primes. |
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1
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| 24, 30, 198, 345, 348, 432, 438, 471, 492, 609, 669, 774, 777, 858, 864, 1032, 1083, 1125, 1218, 1395, 1536, 1824, 1914, 1929, 2088, 2139, 2301, 2334, 2376, 2418, 2448, 2460, 2544, 2763, 2832, 2970, 3021, 3297, 3369, 3384, 3495, 3528, 3540, 3633, 3777
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(6) = 432 because 431999999 and 432000001 are primes.
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MAPLE
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a:=proc(n) if isprime(10^6*n-1)=true and isprime(10^6*n+1)=true then n else fi end: seq(a(n), n=1..4500); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 16 2006
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CROSSREFS
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Cf. A000040, A040040, A045753, A002822, A124065.
Sequence in context: A135045 A109321 A067952 this_sequence A167307 A161378 A064673
Adjacent sequences: A123197 A123198 A123199 this_sequence A123201 A123202 A123203
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KEYWORD
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easy,nonn,less
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 05 2006
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 16 2006
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