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Search: id:A103195
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| A103195 |
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Concatenations of pairs of primes that differ by four. |
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+0
9
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| 37, 711, 1317, 1923, 3741, 4347, 6771, 7983, 97101, 103107, 109113, 127131, 163167, 193197, 223227, 229233, 277281, 307311, 313317, 349353, 379383, 397401, 439443, 457461, 463467, 487491, 499503, 613617, 643647, 673677, 739743, 757761, 769773
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Chris Caldwell, The First 1,000 Primes.
Eric Weisstein's World of Mathematics, Cousin Primes.
M. Wolf, On Twin and Cousin Primes.
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FORMULA
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a(n) = A023200(n) concatenated with A023200(n)+4. - Jonathan Vos Post (jvospost3(AT)gmail.com), Mar 19 2005
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EXAMPLE
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The primes 3 and 7 differ by four, so the first term is 37.
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MATHEMATICA
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s = Select[ Prime[ Range[ 140]], PrimeQ[ # + 4] &]; FromDigits /@ Join @@@ IntegerDigits /@ Transpose[{s, s + 4}] (from Robert G. Wilson v Mar 19 2005)
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CROSSREFS
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Sequence in context: A104180 A010953 A010989 this_sequence A144511 A028225 A028223
Adjacent sequences: A103192 A103193 A103194 this_sequence A103196 A103197 A103198
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KEYWORD
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nonn,base
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Mar 18 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 19 2005
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