38981

Appears in sequences

• a(n) = floor(Pt(n)/n!), where Pt(n) is product of first n positive triangular numbers (A000217).at n=9A233005
• Number of n X 3 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.at n=6A240888
• Number of nX7 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.at n=2A240892
• T(n,k)=Number of nXk 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.at n=38A240893
• T(n,k)=Number of nXk 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.at n=42A240893
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 774", based on the 5-celled von Neumann neighborhood.at n=35A290238
• Numbers whose arithmetic derivative (A003415) is a primorial number (A002110) > 1.at n=24A327978
• a(n) is the least semiprime p*q such that p*q-i*(p+q) is prime for i from 1 to n but not n+1.at n=7A356825
• Numbers k such that A003415(k) == A276085(k) (mod 2310), where A003415 is the arithmetic derivative and A276085 is the primorial base log-function.at n=37A391864