18198

Appears in sequences

• Number of primitive (period n) step cyclic shifted sequence structures using a maximum of four different symbols.at n=12A056441
• Let R(i,j) be the rectangle with antidiagonals 1; 2,3; 4,5,6; ...; the n-th Fibonacci number is in antidiagonal a(n).at n=40A057042
• Numbers n such that Lucas(prime(n)) is prime, where Lucas = A000032.at n=47A120561
• Those n for which A140259(n) = A002264(n+11).at n=19A140260
• Greatest number m such that the fractional part of (3/2)^A153663(n) >= 1-(1/m).at n=17A153667
• a(n) = 25*n^2 - n.at n=26A157514
• a(n) = 729*n^2 - 27.at n=4A158655
• Number of permutations of 1..n containing the relative rank sequence { 135426 } at any spacing.at n=3A159099
• Number of permutations of 1..n containing the relative rank sequence { 163542 } at any spacing.at n=3A159134
• Total number of smallest parts in all partitions of n that do not contain 1 as a part.at n=39A195820
• n*(n^2-2*n-1).at n=26A214446
• a(n) = Sum_{k=1..n} k^floor(n/k).at n=23A345100
• a(n+1) is the least k such that k - (a(n-1)+a(n)) and k + (a(n-1)+a(n)) are primes; a(0)=0, a(1)=1.at n=18A381328