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A163654
The sum of the n-th and (n+1)st isolated prime.
1
25, 60, 84, 100, 120, 146, 162, 172, 186, 210, 240, 258, 288, 320, 330, 340, 384, 434, 456, 484, 508, 520, 540, 570, 600, 624, 648, 668, 690, 712, 726, 740, 752, 762, 772, 786, 798, 810, 848, 882, 892, 906, 924, 946, 966, 978, 990, 1002, 1012, 1050, 1088, 1104, 1120
OFFSET
1,1
LINKS
FORMULA
a(n) = A007510(n) + A007510(n+1).
EXAMPLE
a(1) = 25 = 2+23.
MATHEMATICA
A007510 := Select[Prime[Range[4, 2000]], ! PrimeQ[# - 2] && ! PrimeQ[# + 2] &]; Join[{25}, Table[A007510[[n]] + A007510[[n + 1]], {n, 1, 50}]] (* G. C. Greubel, Aug 01 2017 *)
CROSSREFS
Cf. A007510.
Sequence in context: A266817 A125827 A250191 * A063317 A241505 A090820
KEYWORD
nonn
AUTHOR
EXTENSIONS
330 inserted by R. J. Mathar, Aug 06 2009
STATUS
approved