31871

Appears in sequences

• a(n) = n*(n+1)*(n^2+5*n+18)/24.at n=27A051744
• Number of chains in the power set lattice, or the number of fuzzy subsets of an (n+4)-element set X_(n+4) with specification n elements of one kind, 3 elements of another and 1 of yet another kind.at n=4A107954
• Number of chains in the power set lattice or the number of fuzzy subsets of an (n+5)-element set X_(n+5) with specification n elements of one kind, 4 elements of another and 1 of yet another kind.at n=3A107955
• Number of compositions of n such that the smallest part is divisible by the number of parts.at n=50A171628
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2<=x^2+y^2.at n=35A211634
• Integers of the form 8k + 7 that can be written as a sum of four distinct squares of the form m, m + 2, m + 3, m + 4, where m == 2 (mod 4).at n=21A243581
• Decimal representation of the n-th iteration of the "Rule 137" elementary cellular automaton starting with a single ON (black) cell.at n=8A267512
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 443", based on the 5-celled von Neumann neighborhood.at n=14A282260
• 3*n analog to Keith numbers.at n=15A282758
• 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 539", based on the 5-celled von Neumann neighborhood.at n=14A289045
• a(n) is the smallest b > 1 such that prime(n), prime(n+1) and prime(n+2) are all base-b Wieferich primes.at n=17A344827