login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A080103 Greatest prime power in all composite numbers between n-th prime and next prime, a(n)=1 if no such prime power exists. 2
4, 1, 9, 1, 16, 1, 1, 27, 1, 32, 1, 1, 1, 49, 1, 1, 64, 1, 1, 1, 81, 1, 1, 1, 1, 1, 1, 1, 125, 128, 1, 1, 1, 1, 1, 1, 1, 169, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 243, 256, 1, 1, 1, 1, 1, 1, 289, 1, 1, 1, 1, 1, 1, 343, 1, 1, 1, 361, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; internal format)
OFFSET

2,1

EXAMPLE

There are two prime powers between 7=A000040(4) and 11=A000040(5): 8=2^3 and 9=3^2, therefore a(4)=9, A080102(4)=8 and A080101(4)=2.

CROSSREFS

Cf. A080101, A080102, A025475, A000961.

Sequence in context: A143469 A123726 A138675 * A091419 A181859 A085383

Adjacent sequences:  A080100 A080101 A080102 * A080104 A080105 A080106

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 28 2003

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 .

Last modified February 13 10:39 EST 2012. Contains 205459 sequences.