19430

Appears in sequences

• Numbers k such that k-1, k-3, k-7 and k-9 are all prime.at n=18A064974
• a(n) = 3^n-1+C(2n,n).at n=8A081670
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 0), (0, 0, -1), (0, 1, 1), (1, 0, 0)}.at n=8A150173
• Number of isomorphism classes of connected 3-regular loopless simple graphs with n vertices and with semi-edges allowed.at n=11A243393
• Number of partitions of n into 8 parts such that every i-th smallest part (counted with multiplicity) is different from i.at n=25A244244
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+19395) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=32A283886
• Expansion of Product_{k=1..9} theta_3(q^k), where theta_3() is the Jacobi theta function.at n=48A320241
• Distinct values of A378664(k) in the order of appearance, when k ranges over those primitively abundant numbers k for which A378664(k) is less than the largest proper divisor of k.at n=30A378740