23183

Appears in sequences

• a(n) = least number not of form [ (a^2+b^2)/n ].at n=30A036574
• a(n) = n*coefficient of x^n in log(1+S), S = g.f. for A000084.at n=9A058757
• Expansion of (1-x)/(1+2*x+x^2-2*x^3).at n=28A078063
• a(n) = sum along n-th diagonal of A094102 (sloping downward to left).at n=39A094103
• A transform of (1-x)/(1-2x).at n=21A099517
• Number of different possible rows (or columns) in an n X n crossword puzzle.at n=21A130578
• Base-2 logarithm of (n-th even superperfect number divided by 2^n), plus 1.at n=25A134713
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (1, 0, 0), (1, 0, 1), (1, 1, 1)}.at n=7A151209
• Positions of the records of the negative integers in A179319; a(n) is the first position in A179319 equal to -n.at n=7A183556
• Positions of records in A179319 for both positive and negative integers; A183555 and A183556 merged together.at n=14A183557
• a(n) = ((F(n-1)+F(n-2))-1)/2 if F(n) is odd, otherwise a(n) = ((F(n-1)+F(n-2))-2)/2, where F(n) = A000045(n) is the n-th Fibonacci number.at n=23A201864
• Number of ordered triples (w,x,y) with all terms in {-n, ..., -1, 1, ..., n} and 4w + x + y > 0.at n=18A211629
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 57", based on the 5-celled von Neumann neighborhood.at n=28A278661
• Numerators of coefficients in C(x) where: C(x)^(1/2) - S(x)^(1/2) = 1 such that C'(x)*S(x)^(1/2) = S'(x)*C(x)^(1/2) = 2*x*C(x).at n=11A299430
• Numbers k with property that there is an m = m(k) such that m(m+1)/2 divides k(k+1)/2 and m(k) > m(i) for all i < k.at n=24A309423