43686

Appears in sequences

• Numbers k such that 3*5^k - 2 is prime.at n=28A057917
• Expansion of (1+2x)^2/((1-x^2)(1-2x)).at n=13A085278
• Number of 3 X n (0,1) matrices such that each row and each column is nondecreasing or nonincreasing.at n=26A086113
• Numbers k such that 6*k+5, 6*k+11, 6*k+17, 6*k+23 are consecutive primes.at n=38A090836
• a(n) = n*A007504(n)/2 = n*(sum of first n primes)/2.at n=36A156778
• Irregular triangle read by rows where T(n,k) is the number of non-isomorphic multiset partitions of a multiset with d = A027750(n, k) copies of each integer from 1 to n/d.at n=47A322787
• Array read by antidiagonals: A(n,k) is the number of nonequivalent nonnegative integer matrices with k columns and any number of nonzero rows with column sums n up to permutation of rows and columns.at n=40A331485
• Number of nonequivalent n-column nonnegative integer matrices with column sums 4 and any number of nonzero rows up to permutation of rows and columns.at n=4A331721
• Number of ways to write n as an ordered sum of 9 nonzero decimal palindromes.at n=10A341206
• Partials sums of the cubefull numbers (A036966).at n=35A362971