19348

Appears in sequences

• Engel expansion of exp(2).at n=16A068375
• Number of primes p(i) for i=1 to 20*10^n such that p(i+1)=p(i)+6 and p(i+2)=p(i)+12 and p(i+3)=p(i)+18, 4 consecutive primes in arithmetic progression 0 6 12 18.at n=5A104062
• Triangle read by rows: T(n,k) is the number of secondary structures of size n with no stacks of length >=2 and having k stacks of length 1 (n>=0, k>=0).at n=67A202851
• Number of nondecreasing sequences of n 1..6 integers with every element dividing the sequence sum.at n=34A212534
• Erroneous version of A271811 (but for odd primes only).at n=18A271664
• Triangle read by rows: T(n,k) is the number of bargraphs of semiperimeter n having width k (n>=2, k>=1).at n=72A271942
• Triangle T(n,k) read by rows: the number of independent sets of size k in the 132 core of size n.at n=33A278390
• Array read by ascending antidiagonals: T(n, k) is the number of n-core partitions with k corners.at n=59A355010
• Number of integer partitions of n whose median appears more times than any other part, i.e., partitions containing a unique mode equal to the median.at n=39A363740