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A029707
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Numbers n such that the n-th and the (n+1)-st primes are twin primes.
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74
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2, 3, 5, 7, 10, 13, 17, 20, 26, 28, 33, 35, 41, 43, 45, 49, 52, 57, 60, 64, 69, 81, 83, 89, 98, 104, 109, 113, 116, 120, 140, 142, 144, 148, 152, 171, 173, 176, 178, 182, 190, 201, 206, 209, 212, 215, 225, 230, 234, 236, 253, 256, 262, 265, 268, 277
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Numbers m such that prime(m)^2 == 1 mod (prime(m) + prime(m + 1)). - Zak Seidov, Sep 18 2013
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LINKS
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FORMULA
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MAPLE
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end proc:
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MATHEMATICA
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Flatten[Position[Flatten[Differences/@Partition[Prime[Range[100]], 2, 1]], 2]](* Harvey P. Dale, Jun 05 2014 *)
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PROG
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(Sage)
a = [ ]
for i in (1..n) :
if (nth_prime(i+1)-nth_prime(i) == 2) :
a.append(i)
return(a)
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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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