A079390 spf(n) * spf(n+1) * spf(n+2), where spf=A020639 (smallest prime factor).

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

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 A341637

Adjacent sequences: A079387 A079388 A079389 * A079391 A079392 A079393

Keyword

nonn

Author

Reinhard Zumkeller, Feb 20 2003

Status

approved