20401

Appears in sequences

• Boustrophedon transform of sequence 1,1,0,0,0,0,...at n=9A000756
• Numbers k that divide the (left) concatenation of all numbers <= k written in base 24 (most significant digit on left).at n=13A029493
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 76 ones.at n=35A031844
• Numerators of continued fraction convergents to sqrt(102).at n=3A041182
• Numerators of continued fraction convergents to sqrt(408).at n=3A041774
• 4-Smith numbers.at n=20A103125
• Number of compositions of n into 5 parts such that no two adjacent parts are equal.at n=24A106354
• a(n) = 1250*n^2 + 100*n + 1.at n=3A154375
• a(n) = 5000*n^2 + 200*n + 1.at n=1A157511
• a(n) = 2*prime(n)^2 - 1.at n=25A179262
• Sum of numbers in the n-th antidiagonal of the reciprocity array of 0.at n=43A259574
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 361", based on the 5-celled von Neumann neighborhood.at n=28A287788
• Numbers k such that sigma((k + 1) / 2) is a prime q.at n=14A292446
• Expansion of Product_{k>=1} (1 - x^k)^(2*k-1).at n=31A319669
• Indices n for which the partial sums of sin(k) (0 <= k <= n) reach a new minimum.at n=35A322288
• Numbers of the form (k^2 - 2) / 2 where k - 1 and k + 1 are both odd composite numbers.at n=25A339480