18838

Appears in sequences

• Number of partitions of n into parts not of the form 17k, 17k+5 or 17k-5. Also number of partitions with at most 4 parts of size 1 and differences between parts at distance 7 are greater than 1.at n=39A035966
• Semiprimes in A054552.at n=24A113690
• Denominators of an Egyptian fraction for 1/zeta(2) = 0.607927101854... (A059956).at n=3A144835
• Semiprimes that are the sum of 10 consecutive primes.at n=26A185347
• Number of -6..6 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.at n=5A200190
• T(n,k)=Number of -k..k arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.at n=60A200192
• Number of -n..n arrays x(0..5) of 6 elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.at n=5A200195
• Number of partitions of n where the minimal multiplicity of any part is 2.at n=60A244515
• a(n) = number of new distinct proper angles with vertex and legs on grid points in an n X n square grid that were not found in an (n-1) X (n-1) square grid.at n=35A252592
• Base-2 expansion of a(n) encodes the steps where numbers of the form 4k+1 are encountered when map x -> A252463(x) is iterated down to 1, starting from x=n.at n=42A292381
• Expansion of e.g.f. Product_{k>=1} (1 + x^prime(k))^(1/prime(k)!).at n=9A352005
• Semiprimes that are also the sums of two, three and four successive semiprimes.at n=4A370685