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A181981
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Smallest prime p such that n primes exist between the twin prime pair (p, p+2) and the next twin prime pair.
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3
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3, 17, 41, 107, 71, 2267, 1091, 461, 1319, 1151, 347, 5741, 2999, 5279, 10139, 1487, 9461, 881, 659, 13007, 9041, 15359, 8627, 28751, 83717, 13397, 18539, 14627, 44771, 54011, 60257, 59669, 142157, 77711, 61559, 178931, 26261, 122867, 293261, 89069, 24419
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..40.
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EXAMPLE
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a(4)= 71 because the 4 primes 79, 83, 89, 97 exist between (71, 73) and (101,103).
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MAPLE
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A181981 := proc(n)
local j, hi, lo ;
if n = 0 then
3;
else
for j from 1 do
hi := numtheory[pi](A001359(j+1)) ;
lo := numtheory[pi](A006512(j)) ;
if hi-lo = n+1 then
return A001359(j);
end if;
end do:
end if;
end proc: # R. J. Mathar, Jul 03 2012
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CROSSREFS
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Cf. A001359, A006512, A027833.
Sequence in context: A049078 A209544 A146821 * A089637 A135471 A322755
Adjacent sequences: A181978 A181979 A181980 * A181982 A181983 A181984
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KEYWORD
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nonn
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AUTHOR
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Michel Lagneau, Jul 03 2012
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STATUS
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approved
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