41311

Appears in sequences

• The limiting sequence [A259095(r(r+1)/2-s,r), s=0,1,2,...,r-1] for very large r.at n=46A005576
• a(n) = (117*n^2 - 99*n + 2)/2.at n=27A050408
• Each permutation in the list A060117 converted to Site Swap notation, with digits reversed. "Zero throws" (fixed elements) indicated with 0's.at n=27A060496
• Semiprimes in A054552.at n=35A113690
• Number of terms in A191677 less than or equal to 10^n.at n=4A229299
• a(n) is the smallest composite squarefree number k such that (p+n) | (k-1) for every prime p dividing k.at n=25A274445
• E.g.f.: exp(-Sum_{n>=1} sigma_2(n) * x^n).at n=6A294404
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(-Sum_{j>=1} sigma_k(j) * x^j).at n=42A294951
• 9-gonal numbers that are semiprimes.at n=13A356424