id:A087273 - OEIS Search Results

Search: id:A087273

Displaying 1-1 of 1 results found.

page 1

Largest prime factor of 3*prime(n)+1.

+0
2

7, 5, 2, 11, 17, 5, 13, 29, 7, 11, 47, 7, 31, 13, 71, 5, 89, 23, 101, 107, 11, 17, 5, 67, 73, 19, 31, 23, 41, 17, 191, 197, 103, 19, 7, 227, 59, 7, 251, 13, 269, 17, 41, 29, 37, 23, 317, 67, 31, 43, 7, 359, 181, 29, 193, 79, 101, 37, 13, 211, 17, 11, 461, 467, 47, 17, 71, 23 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=A006530[1+3.A000040[n]]`
	EXAMPLE	`n=100:p[100]=541,m=3.541+1=1624=2.2.2.7.29 so a(100)=29.`
	MATHEMATICA	`ffi[x_] := Flatten[FactorInteger[x]] ma[x_] := Part[Reverse[ffi[x]], 2] Table[ma[3*Prime[w]+1], {w, 1, 100}]`
	CROSSREFS	`Cf. A006530.` `Sequence in context: A112545 A021934 A021097 this_sequence A106040 A085927 A093824` `Adjacent sequences: A087270 A087271 A087272 this_sequence A087274 A087275 A087276`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Sep 18 2003`

page 1

Search completed in 0.002 seconds

Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.

AT&T Labs Research