18765

Appears in sequences

• a(n) = (4*n+3)*(4*n+7).at n=33A085027
• First trisection of A061037 (Balmer line series of the hydrogen atom).at n=45A142590
• Quintisection A061037(5*n+2).at n=27A165248
• a(n) = prime(n)^2-4.at n=32A166010
• Deficient numbers n having a companion m > n such that sigma(n)/n = sigma(m)/m.at n=33A212608
• Number of nondecreasing sequences of 4 1..n integers with no element dividing the sequence sum.at n=27A212871
• G.f. A(x) satisfies A(x) = 1 + x*A(x)*A(x^2)^2.at n=16A217925
• Number of nondecreasing -5..5 vectors of length n whose dot product with some nondecreasing -5..5 vector equals n.at n=6A226408
• Number of nondecreasing -n..n vectors of length 7 whose dot product with some nondecreasing -n..n vector equals 7.at n=4A226415
• Least number k such that k^n + n and k^n - n are both prime, or 0 if no such number exists.at n=13A239475
• a(n) = prime(n)^2 - 4*prime(n).at n=31A245034
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 115", based on the 5-celled von Neumann neighborhood.at n=29A270183
• E.g.f. Sum_{n>=0} Series_Reversion( x*exp(-n*x) )^n.at n=5A299426
• Numbers k such that 24*k-1 has at least three factors 7 and the partition function evaluated at k has at least the same number of factors 7 as 24*k-1.at n=23A340957
• Starts of runs of 3 consecutive integers that are Stolarsky-Niven numbers (A364123).at n=3A364125