29671

Properties

Appears in sequences

• Convolution of A001950 with itself.at n=28A023667
• a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 3.at n=38A050035
• First member of a prime quadruple in a 2p-1 progression.at n=15A057327
• Smallest primes starting a complete three iterations Cunningham chain of the second kind.at n=9A110024
• Smallest primes starting a complete three iterations Cunningham chain of the first or second kind.at n=25A110025
• Mother primes of order 11.at n=36A136070
• Noncomposite numbers in the western ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.at n=15A168025
• Primes such that applying "reverse and add" twice produces two more primes.at n=24A174402
• Partial sums of A033485.at n=43A178855
• Number of partitions of n in which no parts are multiples of 6.at n=42A219601
• T(n,k)=Number of nXk arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns.at n=16A222093
• Number of 2 X n arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns.at n=4A222094
• Number of partitions of n into colored blocks of equal parts, such that all colors from a set of size eight are used and the colors are introduced in increasing order.at n=19A327291
• a(n) = Sum_{k=1..n} floor(n/k) * 3^(k-1).at n=9A344814
• Prime numbers whose base-2 representation is a "nested" palindrome.at n=12A373581
• Prime numbersat n=3220