login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145382 Write the n-th prime in binary. Change all 0's to 1's and all 1's to 0's. a(n) is the decimal equivalent of the result. 3
1, 0, 2, 0, 4, 2, 14, 12, 8, 2, 0, 26, 22, 20, 16, 10, 4, 2, 60, 56, 54, 48, 44, 38, 30, 26, 24, 20, 18, 14, 0, 124, 118, 116, 106, 104, 98, 92, 88, 82, 76, 74, 64, 62, 58, 56, 44, 32, 28, 26, 22, 16, 14, 4, 254, 248, 242, 240, 234, 230, 228, 218, 204, 200, 198, 194, 180, 174 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(n) = A035327(p(n)), where p(n) is the n-th prime.

LINKS

Table of n, a(n) for n=1..68.

FORMULA

a(n)=2^{1+floor(log[2](p(n)))}-n-1, where p(n) is the n-th prime. - Emeric Deutsch, Oct 19 2008

MAPLE

f:=proc(n) options operator, arrow: 2^(1+floor(log[2](n)))-n-1 end proc: seq(f(ithprime(n)), n=1..71); # Emeric Deutsch, Oct 19 2008

CROSSREFS

A171008 gives the binary expansions. Cf. A035327.

Sequence in context: A234312 A244136 A133168 * A192423 A265584 A078909

Adjacent sequences:  A145379 A145380 A145381 * A145383 A145384 A145385

KEYWORD

base,nonn

AUTHOR

Leroy Quet, Oct 09 2008

EXTENSIONS

Extended by Emeric Deutsch, Oct 19 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 8 08:27 EDT 2020. Contains 336293 sequences. (Running on oeis4.)