11735611domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that three consecutive Ramanujan tau numbers are congruent mod 691, or A000594(k) == A000594(k+1) == A000594(k+2) mod 691, or A046694(k) = A046694(k+1) = A046694(k+2).at n=27A121742Prime numbersat n=771819