OFFSET
1,1
EXAMPLE
a(2) = 33 = 3 * 11, a(2) + 2 = 35 = 5 * 7.
a(3) = 663 = 3 * 13 * 17, a(3) + 2 = 665 = 5 * 7 * 19.
PROG
(PARI) isok(k, n) = (omega(k)==n) && (omega(k+2)==n) && issquarefree(k) && issquarefree(k+2)
a(n) = my(k=1); while (!isok(k, n), k++); k; \\ Michel Marcus, Jul 16 2023
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Tomek Czajka, Jul 15 2023
STATUS
approved