23329

Appears in sequences

• Expansion of 1/(1-x^3-x^4-x^5-x^6-x^7-x^8-x^9-x^10-x^11).at n=31A017824
• Least m such that if r and s in {1/1, 1/4, 1/9,..., 1/n^2} satisfy r < s, then r < k/m < s for some integer k.at n=39A024827
• Odd 9-gonal (or enneagonal) numbers.at n=41A028991
• Pierpont semiprimes: semiprimes of the form (2^K)*(3^L)+1.at n=33A113432
• a(n) = (3*a(n-1)*a(n-4) - a(n-2)*a(n-3)) / a(n-5).at n=12A122025
• Difference between first twin prime > 10^n and 10^n.at n=43A124001
• Least positive number k such that 2^k mod k = 2n+1, or 0 if no such k exists.at n=30A124977
• a(n) = 18*n^2 + 1.at n=35A157889
• a(n) = 729*n + 1.at n=31A158397
• a(n) = 32*n^2 + 1.at n=27A158575
• a(n) = 72*n^2 + 1.at n=18A158740
• p^2 + (p+2)^2 - 1 where (p,p+2) is the n-th twin prime pair.at n=9A184417
• a(n) = 3*6^n+1.at n=5A199318
• Number T(n,k) of elements k in all n X n Tesler matrices of nonnegative integers; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=15A259841
• Number of 1 elements in all n X n Tesler matrices of nonnegative integers.at n=5A259843
• Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101.at n=13A261106
• Number of partitions of n^3 into at most two parts.at n=36A274324
• 9-gonal numbers that are semiprimes.at n=10A356424
• Nonprime numbers k whose arithmetic derivative k' (A003415) is a Fibonacci number (A000045).at n=38A362141
• Place n equally spaced points on each side of a square, and join each of these points by a chord to the 3*n new points on the other three sides: sequence gives number of interior vertices in the resulting planar graph.at n=8A367277