99840

Appears in sequences

• [ (4th elementary symmetric function of P(n))/(2nd elementary symmetric function of P(n)) ], where P(n) = {first n+3 primes}.at n=23A024456
• a(n+2) = 2*a(n+1) + 2*a(n); a(0) = -1, a(1) = 1.at n=14A028860
• Graham-Sloane-type lower bound on the size of a ternary (n,3,8) constant-weight code.at n=8A030508
• First element r of (-1)sigma sociable triple (r,s,t): s=(-1)sigma(r), t=(-1)sigma(s), r=(-1)sigma(t), where if x=Product p(i)^r(i), then (-1)sigma(x)=Product(-1+(Sum p(i)^s(i), s(i)=1 to r(i))).at n=27A049057
• a(n) = (n-p_1)(n-p_2)...(n-p_k) where p_k is the k-th prime and is also the largest prime < n.at n=14A080497
• Expansion of g.f. (1-2*x^2)/(1-2*x-2*x^2).at n=12A152035
• a(n) = sigma(2*n^3) - sigma(n^3).at n=29A225959
• Lower Pythagorean twins.at n=34A228876
• Total number of N shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.at n=7A247738
• Number of immersions of unoriented circle into oriented sphere with n labeled double points, where additionally each double point distinguishes one of the 4 half-edges incident to it.at n=3A268557
• Number of nX2 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.at n=3A270052
• Number of nX4 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.at n=1A270054
• T(n,k)=Number of nXk 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.at n=11A270058
• T(n,k)=Number of nXk 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.at n=13A270058
• 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 241", based on the 5-celled von Neumann neighborhood.at n=16A287097
• Expansion of 2*x^2 / (1-2*x-2*x^2).at n=13A293007
• Number of ordered pairs (p,q) of partitions of n such that the set of parts in q is equal to the set of parts in p.at n=30A369695