19494

Appears in sequences

• Expansion of Product_{k>=1} (1 - x^k)^12.at n=26A000735
• Numbers k such that k | sigma_9(k) - phi(k)^9.at n=28A055703
• Number of rods required to make a 3-D cube of side length n.at n=18A059986
• Number of n X n matrices over GF(7) with rank 1.at n=2A060871
• Indices of primes in sequence defined by A(0) = 73, A(n) = 10*A(n-1) + 23 for n > 0.at n=8A101144
• a(n) = Sum_{k=1..n} Fibonacci(k*(n-k)).at n=8A102311
• Triangular matrix T, read by rows, that satisfies T^2 = A105615^3; also equals the matrix cube of triangle A105623.at n=15A105626
• Numbers that have exactly six prime factors counted with multiplicity (A046306) whose digit reversal is different and also has 6 prime factors (with multiplicity).at n=23A109026
• a(n) = a(n-2) + a(n-3) + 2*a(n-4), with a(1) = 0, a(2) = 2, a(3) = 3, a(4) = 10.at n=21A175899
• Number of generalized mountain numbers (see A134853) with n digits.at n=6A178912
• Numbers n such that 4n+1 is a palindromic prime.at n=41A192261
• Expansion of f(x)^12 in powers of x where f() is a Ramanujan theta function.at n=26A209676
• Number of (w,x,y) with all terms in {0,...,n} and 2*max(w,x,y) > 3*min(w,x,y).at n=27A213393
• Number of permutations of 0..floor((n*6-2)/2) on odd squares of an n X 6 array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.at n=7A215866
• Positions of 3's in A234323.at n=51A234804
• Positive integers, c, such that there are more than two solutions to the equation a^2 + b^3 = c^4, with a, b > 0.at n=18A242381
• Least positive integer m with prime(m)+2 and prime(prime(m))+2 both prime such that prime(m*n)+2 and prime(prime(m*n))+2 are both prime.at n=13A259487
• Differences of the increasing arithmetic progression a^2+a, b^2+b, c^2+c, where b = 5*a+2, c = 7*a+3 and a >= 0.at n=28A260955
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 942", based on the 5-celled von Neumann neighborhood.at n=33A273797
• Binomial transform of A001156.at n=13A294529