39819

Appears in sequences

• a(n) = ((1 + 3*sqrt(2))^n - (1 - 3*sqrt(2))^n)/(2*sqrt(2)).at n=7A125817
• a(n) = round( 2*Gamma(3 + n/3) + 2^(n/3) ).at n=17A133756
• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=3, k=-1 and l=-1.at n=9A176956
• Sum of the numbers already killed in the first jump of a Sieve of Eratosthenes table.at n=40A179628
• Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..2 array extended with zeros and convolved with 1,4,6,4,1.at n=23A221993
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3), 3-principalization type (4443), IPAD [(3,3,3)^3, (3,9)], and Hilbert 3-class field tower of unknown length at least 3.at n=9A242873
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) whose second 3-class group is located on the sporadic part of the coclass graph G(3,2) outside of coclass trees.at n=32A247691
• Numbers that can be represented in more than one way as p^2+p*q+q^2 with p and q primes, p<=q.at n=31A349987
• Record high-points in A367356.at n=4A367598
• a(n) = 4*n^3 - 6*n^2 + 6*n - 2 + (-1)^n.at n=21A382973