27676

Appears in sequences

• a(n) = (2*n-1)*(5*n^2-5*n+6)/6.at n=25A063489
• a(n) = Sum_{0<j<k<=n} k^3-j^3.at n=9A206809
• a(n) = n*(n + 1)*(3*n^2 + 3*n - 2)/8.at n=16A236770
• Number of partitions p of n containing ceiling((min(p) + max(p))/2) as a part.at n=44A238484
• Pentagonal numbers (A000326) that are the sum of eleven consecutive pentagonal numbers.at n=1A259403
• Pentagonal numbers (A000326) in which parity of digits alternates.at n=22A297644
• Pentagonal numbers divisible by 4.at n=34A298397
• a(n) = 54*2^n + 28 (n >= 1).at n=8A304606
• a(n) = number of k-tuples (u(1), u(2), ..., u(k)) with 1 <= u(1) < u(2) < ... < u(k) <= n such that u(i) - u(i-1) <= 3 for i = 2,...,k.at n=15A356619
• Symmetric difference of the primitive non-deficient numbers and the primitive Zumkeller numbers.at n=8A378538
• Numbers that are primitive Zumkeller, but not primitive non-deficient.at n=5A378657
• Pentagonal numbers that are abundant.at n=45A379264
• a(1) = 1 and thereafter a(n) = a(n-1) + j(n-1) where j(1) = 1 and then j(n) = j(n-1)-1 if a(n) is composite or j(n) = 2*j(n-1) if a(n) is prime.at n=42A382671