265722

Appears in sequences

• Numbers k such that 9^k == -1 (mod k-1).at n=11A055692
• Number of vertices in Sierpiński triangle of order n.at n=11A067771
• a(1)=1; then successively add 1, divide by 2, add 2 and then total up the last 4 terms.at n=47A112027
• a(0) = 2, a(n) = 3*a(n-1) - 3.at n=12A115098
• a(n) = 6 * A015518(n).at n=11A120471
• a(n) = 3*A132357(n).at n=10A135264
• a(n) = 4*n^3 - 18*n^2 + 27*n - 12.at n=41A271828
• a(1) = 1, a(2) = 3; for n > 1, a(n) = sum of the next two smallest integers > a(n-1) which are coprime to the sum s = a(1) + ... + a(n-1).at n=16A308669