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A033843 Number of twin primes < 2^n. 1
0, 1, 2, 3, 5, 7, 10, 17, 24, 36, 62, 107, 177, 290, 505, 860, 1526, 2679, 4750, 8535, 15500, 27995, 50638, 92246, 168617, 309561, 571313, 1056281, 1961080, 3650557, 6810670, 12739574, 23878645, 44849427, 84384508, 159082253, 300424743 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

LINKS

Index entries for sequences related to numbers of primes in various ranges

CROSSREFS

Cf. A007053, A007508.

Sequence in context: A052011 A005468 A104622 * A075657 A039711 A194261

Adjacent sequences:  A033840 A033841 A033842 * A033844 A033845 A033846

KEYWORD

nonn,hard

AUTHOR

Vasiliy Danilov (danilovv(AT)usa.net) Jun 15 1998

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Last modified February 16 04:18 EST 2012. Contains 205860 sequences.