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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A078553 Largest prime dividing sigma[4,n]. 0
17, 41, 13, 313, 41, 1201, 257, 73, 313, 7321, 41, 14281, 1201, 313, 41, 41761, 73, 3833, 313, 1201, 7321, 139921, 257, 601, 14281, 193, 1201, 353641, 313, 1129, 241, 7321, 41761, 1201, 73, 10529, 3833, 14281, 313, 10313, 1201, 521, 7321, 313 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=A006530[A001159(n)]

EXAMPLE

Observe nontrivial frequent occurrence of several primes like 73,313,14281, etc.

CROSSREFS

Cf. A006530, A001157-A001160, A071190.

Sequence in context: A070143 A140679 A152817 * A104043 A076330 A087658

Adjacent sequences:  A078550 A078551 A078552 * A078554 A078555 A078556

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Dec 05 2002

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 14 23:53 EST 2012. Contains 205689 sequences.