OFFSET
1,1
EXAMPLE
97 is a term because (77 + 85 + 87 + 91 + 93 + 95 + 111 + 115 + 119)/9 = 97 is prime.
401 is a term because (381 + 391 + 393 + 395 + 403 + 407 + 411 + 413 + 415)/9 = 401 is prime.
MATHEMATICA
Select[Mean /@ Partition[Select[Range[1, 9000, 2], PrimeOmega[#] == 2 &], 9, 1], PrimeQ] (* Amiram Eldar, Sep 25 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Elmo R. Oliveira, Sep 25 2023
STATUS
approved