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A000885 Number of twin prime pairs < square of n-th prime. 3
0, 2, 4, 6, 10, 12, 19, 21, 25, 33, 35, 46, 53, 56, 67, 80, 93, 98, 117, 128, 131, 146, 160, 174, 195, 210, 217, 227, 233, 244, 286, 298, 325, 331, 376, 386, 406, 423, 444, 467, 492, 505, 554, 561, 581, 589, 641, 700, 723, 732, 748, 780, 789, 835, 868, 895, 938, 945, 975 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..10000

MATHEMATICA

With[{tpps=Select[Partition[Prime[Range[10000]], 2, 1], Last[#]- First[#] == 2&]}, Table[ Count[tpps, _?(Last[#]<Prime[n]^2&)], {n, 60}]] (* Harvey P. Dale, Aug 11 2011 *)

CROSSREFS

Cf. A000879.

Sequence in context: A055235 A083887 A064374 * A068336 A293821 A194944

Adjacent sequences:  A000882 A000883 A000884 * A000886 A000887 A000888

KEYWORD

nonn

AUTHOR

gandalf(AT)hrn.office.ssi.net (James D. Ausfahl)

EXTENSIONS

More terms from David W. Wilson

STATUS

approved

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Last modified August 10 02:28 EDT 2020. Contains 336367 sequences. (Running on oeis4.)