20613

Appears in sequences

• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (odd natural numbers), t = A001950 (upper Wythoff sequence).at n=35A024600
• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = A001950 (upper Wythoff sequence).at n=34A025114
• a(n) = 2nd elementary symmetric function of C(n,0), C(n,1), ..., C(n,[ n/2 ]).at n=7A025136
• Base-8 palindromes that start with 5.at n=20A043025
• Triangle T, read by rows, such that diagonal n equals column 0 of T^(n+1), the (n+1)-th matrix power of T.at n=53A098447
• Row sums of triangle A098447, in which diagonal n equals column 0 of the (n+1)-th matrix power of A098447.at n=8A098448
• Numerators of partial sums of a convergent series with value 4, involving scaled Catalan numbers A000108.at n=7A119951
• Triangle of numbers obtained from the partition array A134284.at n=37A134285
• Number of possible values of C(v) = the number of valid mountain-valley assignments for a flat-foldable origami vertex v of degree 2n.at n=25A156209
• Last term where no prime sums occur in A161190 in a 4-diagonal set of 24 terms.at n=9A161193
• Palindromic numbers in bases 2 and 8 written in base 10.at n=42A259380
• Numbers k such that (17*10^k + 79)/3 is prime.at n=26A273728
• 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 902", based on the 5-celled von Neumann neighborhood.at n=14A284357
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 902", based on the 5-celled von Neumann neighborhood.at n=14A284358
• Numbers k such that k, k+1, k+2, k+3 have 2, 3, 4, 5 prime factors respectively, counted with multiplicity.at n=24A363391
• Expansion of (1/x) * Series_Reversion( x * (1+x^3/(1-x))^2 ).at n=14A369077
• Squarefree semiprimes k such that k+1 is the product of three distinct primes and k+2 is the product of four distinct primes.at n=23A376352
• Number of minimal edge cuts in the n-Plummer-Toft graph.at n=12A378924
• Consecutive states of the linear congruential pseudo-random number generator for 32-bit WATFOR/WATFIV when started at 1.at n=1A384159