-860

Appears in sequences

• Glaisher's function H'(4n+1) (18 squares version).at n=10A002610
• a(n) = (n+1)*(2-n)/2.at n=42A080956
• Reversion of Pell numbers A000129(n+1).at n=9A104565
• Row sums of number triangle related to the Jacobsthal numbers.at n=21A110325
• Semiprime(n)*semiprime(n+3) - semiprime(n+1)*semiprime(n+2), where semiprime(n) is the n-th semiprime.at n=44A118780
• Determinants of 3 X 3 matrices of continuous blocks of 9 consecutive semiprimes.at n=22A118781
• Alternating LCM-sum: a(n) = Sum_{k=1..n} (-1)^(k-1)*lcm(k,n).at n=42A199806
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 203", based on the 5-celled von Neumann neighborhood.at n=17A270728
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 662", based on the 5-celled von Neumann neighborhood.at n=35A273391
• a(n) = Re([n]_{1+i}!), where [n]_q! is the q-factorial, i = sqrt(-1).at n=6A275706
• G.f. A(x,y) satisfies: A(x,y) = x*y + 1/A(x,x*y), with A(0,y) = 1.at n=153A275760
• Coefficients in the expansion of ([r^2] + [2r^2]x + [3r^2]x^2 + ...)/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = golden ratio = (1 + sqrt(5))/2.at n=13A279586
• Expansion of Product_{k>=1} 1/(1 - x^k/(1 + x)).at n=19A307626
• a(1) = 1; a(n) = -Sum_{d|n, d < n} A341512(n/d) * a(d), where A341512(n) = sigma(n)*A003961(n) - n*sigma(A003961(n)).at n=27A347096
• Expansion of (1/x) * Series_Reversion( x * ((1-x)^4 + x) ).at n=6A371436
• Determinant of the 3 X 3 Hankel matrix of consecutive primes starting at prime(n).at n=21A392522