This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A049386 Binary order of 2^n-th prime. 0
 1, 2, 3, 5, 6, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n)=A029837[ A033844[ n ] ] a(n)=Ceiling[Log[2, Prime[2^n]]] EXAMPLE The 549755813888th=2^39th prime is 16149760533341 of which the binary order is 44: it is Ceiling[43.87657801]=44, so a(39)=44; a(0)=1 is the binary order of 2^0th=first prime(=2) which is Log[2,2] =1 CROSSREFS Cf. A029837, A033844, A006988. Sequence in context: A039249 A039191 A214329 * A188320 A039143 A039104 Adjacent sequences:  A049383 A049384 A049385 * A049387 A049388 A049389 KEYWORD nonn AUTHOR Labos E. (labos(AT)ana.sote.hu) STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .