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A176915 Average of n-th twin prime pair minus total number of prime factors of average of n-th twin prime pair. 0
2, 4, 9, 15, 27, 39, 56, 67, 99, 103, 135, 146, 175, 185, 194, 224, 234, 265, 279, 307, 344, 415, 425, 458, 518, 566, 594, 615, 639, 655, 804, 819, 823, 854, 877, 1015, 1027, 1045, 1058, 1087, 1143, 1226, 1274, 1286, 1298, 1314, 1423, 1447, 1478, 1482, 1603 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Prime factors are counted with multiplicity. [from Harvey P. Dale, Aug 19 2011]

LINKS

Table of n, a(n) for n=1..51.

FORMULA

a(n)=A014574(n)-A078571(n).

MATHEMATICA

f[n_]:=Module[{mn=Mean[n]}, mn-PrimeOmega[mn]]; f/@Select[Partition[ Prime[ Range[300]], 2, 1], Last[#]-First[#]==2&] (* Harvey P. Dale, Aug 19 2011 *)

CROSSREFS

Sequence in context: A072846 A157254 A080004 * A060742 A060737 A266647

Adjacent sequences:  A176912 A176913 A176914 * A176916 A176917 A176918

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Apr 28 2010

EXTENSIONS

Formula index, a(8), a(15) and a(23) corrected by R. J. Mathar, May 01 2010

STATUS

approved

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Last modified September 30 09:26 EDT 2022. Contains 357104 sequences. (Running on oeis4.)