18431

Appears in sequences

• Smallest positive integer not representable as the sum of at most n distinct numbers of form 2^a*3^b.at n=4A018899
• Expansion of (1+x^2-x^3)/((1-x)*(1-2*x)).at n=13A052996
• a(n) = p(0) + p(1) + ... + p(n) - n - 1, where p = partition numbers, A000041.at n=28A058682
• Nonprime solutions to k == -1 (mod phi(k+1)).at n=39A067930
• Number of columns in the character table of the symmetric group S_n that have zero sum.at n=36A085642
• (p*q - 1)/2 where p and q are consecutive odd primes.at n=41A102770
• (Product of twin primes - 1)/2.at n=13A120876
• a(n) = 18*n^2 - 1.at n=31A157910
• a(n) = 512n - 1.at n=35A158011
• a(n) = 576*n - 1.at n=31A158372
• a(n) = 1024*n - 1.at n=17A158421
• a(n) = 32*n^2 - 1.at n=23A158563
• a(n) = 72*n^2 - 1.at n=15A158738
• Integers n such that exactly 80 percent of the digits in base 2 are 1's.at n=40A163142
• Increasing sequence S generated by these rules: a(1)=1, and if x is in S then both 3x+2 and 4x+3 are in S.at n=35A191145
• Number of lattice points in the closed region bounded by the graphs of y = (5/6)*x^2, x = n, and y = 0, excluding points on the x-axis.at n=39A227347
• Record values in A135141.at n=25A246347
• Odd numbers n such that the sum of the binary digits of n and n^2 both equal 12.at n=14A261593
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 613", based on the 5-celled von Neumann neighborhood.at n=14A283293
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 809", based on the 5-celled von Neumann neighborhood.at n=14A286858