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1, 3, 5, 7, 13, 26, 28, 43, 49, 64, 69, 78, 89, 93, 96, 116, 131, 134, 142, 148, 152, 155, 167, 182, 202, 206, 212, 225, 231, 234, 236, 238, 247, 253, 258, 281, 286, 302, 303, 311, 313, 330, 332, 333, 334, 336, 337, 356, 362, 384, 385, 390, 435, 438, 455, 458, 484, 492, 512, 516
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OFFSET
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1,2
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COMMENTS
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Numbers n with property that 2*prime(n)-prime(n+1) = 2*prime(n+1)-prime(n+2), or 2*prime(n)+prime(n+2) = 3*prime(n+1).
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LINKS
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EXAMPLE
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MAPLE
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Primes:= select(isprime, [2, (2*i+1 $ i=1..10^4)]):
Gaps:= Primes[2..-1] - Primes[1..-2]:
G2:= Gaps[2..-1] - 2*Gaps[1..-2]:
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MATHEMATICA
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Select[Range@ 600, 2 Prime[#] - Prime[# + 1] == 2 Prime[# + 1] - Prime[# + 2] &] (* Michael De Vlieger, May 11 2015 *)
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PROG
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(Magma) [n: n in [0..600] | 2*NthPrime(n)-NthPrime(n+1) eq 2*NthPrime(n+1)-NthPrime(n+2)]; // Vincenzo Librandi, May 12 2015
(Haskell)
a257762 n = a257762_list !! (n-1)
a257762_list = map a258432 $ filter ((== 2) . a258383) [1..]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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