18678

Appears in sequences

• Number of partitions of n that do not contain 2 as a part.at n=43A027336
• Numbers with multiplicative persistence value 6.at n=18A046515
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,21.at n=24A064247
• Numbers n for which there are exactly seven k such that n = k + reverse(k).at n=38A072431
• A Wallis pair (x,y) satisfies sigma(x^2) = sigma(y^2); sequence gives x's for indecomposable Wallis pairs with x < y (ordered by values of x).at n=40A075768
• First differences of the partition numbers of the primes.at n=13A182739
• a(0)=0: a(n)=A002865(2*n)+A002865(2*n+1), n>=1.at n=21A182844
• Composite numbers whose multiplicative persistence is 6.at n=17A199996
• Irreducible near matchings over 2n+1 vertices.at n=4A212553
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 603", based on the 5-celled von Neumann neighborhood.at n=25A273173
• Number of relatively prime or monic twice-partitions of n.at n=14A302094