28978

Appears in sequences

• a(1)=a(2)=1. a(n+1) = a(n) + a(smallest prime dividing n).at n=43A128216
• Number of partitions of 12*n into parts < 5.at n=13A191593
• Number of 7X2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 7 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=17A192707
• Number of (n+1)X(1+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise.at n=2A235574
• Number of (n+1)X(3+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise.at n=0A235576
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise.at n=3A235577
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise.at n=5A235577
• Number of (n+1)X(3+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.at n=0A235817
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.at n=3A235818
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.at n=5A235818
• Number of (3+1)X(n+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.at n=0A235820
• Number of partitions of 4n into 4 parts.at n=39A238340
• Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.at n=4A252634
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.at n=19A252640
• Number of (5+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.at n=1A252645
• Number of partitions of 5n into exactly 4 parts.at n=32A256327
• Numbers k such that (19*10^k - 61)/3 is prime.at n=21A285939