18573

Appears in sequences

• Numbers that are the sum of 4 positive 7th powers.at n=19A003371
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite BEA = Beta Na7[Al7Si57O128] starting with a T7 atom.at n=13A019073
• Numbers k such that sigma(k+1) - sigma(k) = sigma(k)/d(k), where d(k) denotes the number of divisors of k.at n=8A066176
• Number of up/down (or down/up) compositions of n into distinct parts.at n=36A129838
• Values of m such that A139361(n)=4m+1.at n=34A139362
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 331", based on the 5-celled von Neumann neighborhood.at n=30A271279
• Number of even parts in the partitions of n into 7 parts.at n=46A309625
• Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.at n=7A316172
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.at n=58A316176
• G.f.: Sum_{k>=0} x^k * Product_{j=1..4*k} (1 + x^j).at n=51A385068