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A175147 a(n) = number of primes p, p <= 2^n, where 2^n + p is prime. 1
0, 0, 1, 2, 3, 3, 5, 9, 11, 18, 32, 51, 84, 151, 254, 429, 754, 1311, 2377, 4199, 7584, 13785, 24955, 45840, 84002, 153515, 283659, 524648, 976217, 1817659, 3392835, 6348677, 11898310 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Terms through a(18) calculated by M. F. Hasler. Terms through a(29) calculated by Rick Shepherd.

LINKS

Table of n, a(n) for n=0..32.

FORMULA

a(n) = A007053(n) - A175148(n).

CROSSREFS

Cf. A007053, A175148.

Sequence in context: A194000 A065460 A241741 * A001180 A228778 A019460

Adjacent sequences:  A175144 A175145 A175146 * A175148 A175149 A175150

KEYWORD

more,nonn

AUTHOR

Leroy Quet, Feb 24 2010

EXTENSIONS

a(30)-a(32) from Ray Chandler, Mar 05 2010

STATUS

approved

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Last modified July 21 04:27 EDT 2017. Contains 289632 sequences.