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A120876 (Product of twin primes -1)/2. 1
7, 17, 71, 161, 449, 881, 1799, 2591, 5201, 5831, 9521, 11249, 16199, 18431, 19601, 25991, 28799, 36449, 39761, 48671, 60551, 88199, 93311, 106721, 136241, 162449, 179999, 190961, 206081, 217799, 328049, 337841, 342791, 368081 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n) = A120875(n)/2 = A075369(n)/2 -1.

MATHEMATICA

(Times@@#-1)/2&/@Select[Partition[Prime[Range[200]], 2, 1], Last[#]- First[#]== 2&] (* From Harvey P. Dale, June 26 2011 *)

CROSSREFS

Sequence in context: A118431 A051809 A034054 * A086870 A107693 A122528

Adjacent sequences:  A120873 A120874 A120875 * A120877 A120878 A120879

KEYWORD

nonn

AUTHOR

Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 09 2006

EXTENSIONS

Corrected by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006

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Last modified February 15 04:23 EST 2012. Contains 205694 sequences.