login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A079390 spf(n) * spf(n+1) * spf(n+2), where spf=A020639 (smallest prime factor). 1
6, 12, 30, 20, 70, 28, 42, 12, 66, 44, 286, 52, 78, 12, 102, 68, 646, 76, 114, 12, 138, 92, 230, 20, 30, 12, 174, 116, 1798, 124, 186, 12, 30, 20, 370, 148, 222, 12, 246, 164, 3526, 172, 258, 12, 282, 188, 658, 28, 42, 12, 318, 212, 530, 20, 30, 12, 354, 236, 7198, 244 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For n>2, a(n) is a record value iff (n,n+2) is a twin prime pair (conjecture).

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Times@@@Partition[Table[FactorInteger[n][[1, 1]], {n, 70}], 3, 1] (* Harvey P. Dale, Oct 06 2015 *)

CROSSREFS

Cf. A001359, A006512, A014574.

Sequence in context: A109510 A034715 A294730 * A124679 A242949 A143272

Adjacent sequences:  A079387 A079388 A079389 * A079391 A079392 A079393

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Feb 20 2003

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 December 2 23:09 EST 2020. Contains 338898 sequences. (Running on oeis4.)