124465

Appears in sequences

• Binomial transform of {1, primes}.at n=13A030015
• Number of 5-almost primes less than or equal to 10^n.at n=6A114453
• Triangle read by rows: T(k,n) is number of numbers <= 10^n that are products of k primes.at n=51A126280
• a(n) = 1 + 4*n*(1 + 2*n^2)/3.at n=36A171272
• a(n) = a(n-1) + a(n-3) unless a(n-1) and a(n-3) are both even in which case a(n) = (a(n-1) + a(n-3))/2, with a(0) = a(1) = a(2) = 1.at n=40A341312