168305domain: NAppears in sequencesNumbers k such that k | 4^k + 1.at n=19A015950Numbers k that divide 4^k + 1, k not a power of 5.at n=11A015974Numbers k that divide 8^k + 2^k.at n=42A045581Numbers k such that k^3 divides 4^(k^2) + 1.at n=6A128678Numbers k such that k^2 divides 4^k + 1.at n=3A292330