18759

Appears in sequences

• Numbers k such that 11*2^k + 1 is prime.at n=16A002261
• Number of solutions to e(1)*1 + e(2)*2 + ... + e(n)*n = e(-1)*1 + e(-2)*2 + ... + e(-n)*n, where e(j) are from {-1,0,1}, j=-n,...,n.at n=6A156181
• a(n) = n*(14*n - 11).at n=37A195021
• a(n) = (n-2)*(14*n-39) for n > 2, otherwise a(n) = n.at n=39A195030
• Numbers k such that A057775(k) is the factor of a Fermat number 2^(2^m) + 1 for some m.at n=49A201364
• Number of (n+1)X(n+1) -7..7 symmetric matrices with every 2X2 subblock having sum zero and one or three distinct values.at n=8A211443
• Number of triples (w,x,y) with all terms in {0,...,n} and w < floor((x+y)/3).at n=38A212971
• Least k such that (2*n-1)*2^k + 1 is a prime factor of a Fermat number 2^(2^m) + 1 for some m, or 0 if no such value exists.at n=5A215540
• Numbers k such that (58*10^k + 221)/9 is prime.at n=22A291661
• Triangle read by rows. Numerators of the coefficients of a sequence of rational polynomials r_n(x) with r_n(1) = B(2*n), where B(n) are the Bernoulli numbers.at n=31A356652