1,1

Why are so many of the t-1's brilliant numbers (A078972)?

Table of n, a(n) for n=1..34.

Select[Accumulate[Range[1000]], PrimeOmega[#-1]==PrimeOmega[#+1]==2&] (* Harvey P. Dale, Jul 06 2014 *)

Sequence in context: A257712 A250607 A076579 * A048190 A090391 A275083

Adjacent sequences: A121895 A121896 A121897 * A121899 A121900 A121901

nonn

Jason Earls, Sep 01 2006

approved