24375

Appears in sequences

• a(n) = (2*n - 11)*n^2.at n=25A015245
• A convolution triangle of numbers obtained from A036083.at n=17A030527
• Column 4 of triangle A055898.at n=8A055900
• Numbers k such that Sum_{d|k} tau(d)/d is an integer, where tau(x) = A000005(x).at n=6A068978
• Numbers k such that S(k)=d(k), where S(k) is the Kempner function (A002034) and d(k) is the number of divisors of k (A000005).at n=21A073307
• Numbers n such that number of divisors of n divides S(n), the Kempner function A002034.at n=32A073413
• Row sums of the triangle described in A082200.at n=28A082203
• Partial sums of n 3-spaced triangular numbers beginning with t(2), e.g., a(2) = t(2) + t(5) = 3 + 15 = 18.at n=24A085789
• a(n) = J_4(n)/240.at n=44A115002
• a(n) = 5*a(n-1) + 10*a(n-2).at n=5A138322
• Positive integers n such that n^2 = (x^4 - y^4)*(z^4 - t^4) where the pairs of integers (x,y) and (z,t) are not proportional.at n=20A147854
• a(n) = 16n^2 + n.at n=38A157474
• a(n) = 1521*n^2 + 39.at n=4A158768
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=36A252407
• Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=8A252408
• Odd numbers of the form (m*k)^2/(m^2-k^2) for distinct integers m and k.at n=20A259288
• Odd numbers m such that there exists no k for which the denominator of d(k)/k = m where d(k) is the number of divisors of k (A000005).at n=20A353320
• Numbers k such that 30*k - 1, 30*k + 1, 30*k^2 - 1 and 30*k^2 + 1 are all prime.at n=36A359184