26624

Appears in sequences

• a(n) = 13*2^n.at n=11A005029
• a(n) = Sum_{k=floor((n+1)/2)..n} T(k,n-k); i.e., a(n) is the n-th diagonal sum of left-justified array T given by A026998.at n=24A027010
• a(n) = T(n,3), array T as in A049600.at n=10A049612
• Primitive numbers k that divide sigma(k)*phi(k).at n=15A055196
• Triangle of partial row sums (prs) of triangle A055252.at n=45A055584
• a(0)=0, a(1)=1, a(n) = n*2^(n-2) for n >= 2.at n=13A057711
• a(n) = 3^n * Sum_{i=1..n} i^3/3^i.at n=7A066999
• 12-almost primes (generalization of semiprimes).at n=12A069273
• Where records occur in A063574.at n=11A075662
• Main diagonal of the table of k-almost primes (A078840): a(n) = (n+1)-st integer that is an n-almost prime.at n=12A078841
• Numbers of the form (2^i)*(13^j).at n=38A107326
• Numbers n such that A067824(n) = n.at n=20A122408
• Numbers whose binary expansion is 1xy100...0 where x,y = 0 or 1.at n=46A123760
• Row sums of triangle A128182.at n=11A128183
• Binomial transform of A124625.at n=13A129952
• Record values in A003415 (arithmetic derivative).at n=30A131116
• Numbers k whose squares can be written in exactly one way as a sum of three squares: k^2 = a^2 + b^2 + c^2 with 1 <= a <= b <= c.at n=37A152829
• a(1) = 1. For n >=2, a(n) = the smallest integer > a(n-1) such that both a(n) and a(n)-a(n-1) have the same number of (non-leading) 0's when they are represented in binary.at n=25A160825
• a(n) = 12*a(n-1) - 34*a(n-2) for n > 1; a(0) = 1, a(1) = 8.at n=5A163444
• Numbers k such that tau(phi(k)) = rad(k).at n=16A173618