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A144550
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Largest non-twin prime < n-th and (n+1)-th twin primes.
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0
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2, 23, 37, 53, 67, 97, 131, 173, 223, 233, 263, 277, 307, 337, 409, 457, 509, 563, 593, 613, 631, 653, 797, 853, 877, 1013, 1039, 1087, 1129, 1223, 1259, 1283, 1297, 1307, 1423, 1447, 1471, 1601, 1613, 1663, 1693, 1709, 1783, 1867, 1913, 1993, 2017, 2069
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| {A007510(k): nextprime(A007510(k)) in A077800}. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 01 2010]
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MAPLE
| Contribution from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 01 2010: (Start)
isA077800 := proc(n) isprime(n) and ( isprime(n+2) or isprime(n-2)) ; end proc:
isA007510 := proc(n) isprime(n) and not isA077800(n) ; end proc:
isA144550 := proc(n) isA007510(n) and isA077800( nextprime(n)) ; end proc:
for n from 2 to 2500 do if isA144550(n) then printf("%d, ", n) ; end if; end do: (End)
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CROSSREFS
| Cf. A000040, A077800.
Sequence in context: A115233 A007510 A117242 * A106736 A045392 A107374
Adjacent sequences: A144547 A144548 A144549 * A144551 A144552 A144553
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KEYWORD
| nonn
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AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Dec 31 2008
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EXTENSIONS
| Corrected (1993 inserted) by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 01 2010
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