26672

Appears in sequences

• Arithmetic derivative of (prime(n)+1)*(prime(n+1)+1)/4.at n=41A079094
• Composite numbers, not ending with 0, sharing a 3-digit sequence with some of its prime factors.at n=33A131523
• Expansion of o.g.f. (1/2)*(-1 + 1/sqrt(1 - 4*x - 4*x^2)).at n=8A179191
• Smallest even k such that lpf(k-1) = prime(n), while lpf(k-3) > prime(n), where lpf=least prime factor (A020639).at n=33A242489
• Numbers k such that (23*10^k + 97)/3 is prime.at n=21A282277
• Expansion of (theta_3(z)*theta_3(23z) + theta_2(z)*theta_2(23z))^5.at n=20A328093
• a(n) is the number of edges formed by n-secting the angles of an octagon.at n=35A335771
• Number of set-systems S composed of nonempty subsets of [n] such that any element k in S appears at most k times.at n=5A374453