OFFSET
1,1
LINKS
Rick L. Shepherd, Table of n, a(n) for n = 1..10000
EXAMPLE
The number 19 is a term because 18 = 2*3^2 and 20 = 2^2*5 each have two distinct prime factors and each have three prime factors when counted with multiplicity.
MATHEMATICA
Select[Range[800], PrimeNu[#]==PrimeNu[#+2]&&PrimeOmega[#]==PrimeOmega[#+2]&]+1 (* Harvey P. Dale, Jul 12 2023 *)
PROG
(PARI) IsInA280383(n) = n > 1 && bigomega(n-1) == bigomega(n+1) && omega(n-1) == omega(n+1)
CROSSREFS
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Jan 02 2017
STATUS
approved