1628033

Appears in sequences

• Octagonal numbers equal to S*(3S - 2) with 3S - 2 = k^2 and S semiprime.at n=16A124106
• Octagonal numbers of the form C*(3C - 2) with 3C - 2 = k^2 and C a composite number.at n=22A125511
• Crystal ball sequence for the lattice C_4.at n=23A142993
• Number of n-length words over a quaternary alphabet {a_1,a_2,...,a_4} avoiding consecutive letters a_i, a_{i+1}.at n=12A277667