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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A078311 Smallest prime factor of n*rad(n)+1, where rad=A007947 (squarefree kernel). 3
2, 5, 2, 3, 2, 37, 2, 17, 2, 101, 2, 73, 2, 197, 2, 3, 2, 109, 2, 3, 2, 5, 2, 5, 2, 677, 2, 3, 2, 17, 2, 5, 2, 13, 2, 7, 2, 5, 2, 401, 2, 5, 2, 3, 2, 29, 2, 17, 2, 3, 2, 3, 2, 5, 2, 5, 2, 5, 2, 1801, 2, 5, 2, 3, 2, 4357, 2, 3, 2, 13, 2, 433, 2, 5477, 2, 3, 2, 5, 2, 3, 2, 5, 2, 3529, 2, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n)=A020639(A078310(n)).

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

PROG

(Haskell)

a078311 = a020639 . a078310  -- Reinhard Zumkeller, Jul 23 2013

CROSSREFS

Cf. A078312.

Sequence in context: A102707 A134486 A088006 * A132743 A192885 A246904

Adjacent sequences:  A078308 A078309 A078310 * A078312 A078313 A078314

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Nov 23 2002

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 July 24 03:01 EDT 2019. Contains 325290 sequences. (Running on oeis4.)