28483

Appears in sequences

• (1/168)*(sigma_7(2n-1)-sigma_1(2n-1)).at n=4A081862
• a(n) = -a(n-2) + 2*a(n-4) - a(n-10).at n=31A089135
• D'Agapeyeff cipher.at n=7A135209
• a(n) = Sum_{k=1..n} k*sigma(k).at n=36A143128
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 1), (0, 0, -1), (0, 1, -1), (1, 0, 0)}.at n=10A148338
• Erroneous version of A140763.at n=32A159579
• Index of record values in A247190.at n=42A250985
• Number of length-4 0..n arrays with no repeated value greater than the previous repeated value.at n=11A269436
• Numbers k such that (206*10^k - 17)/9 is prime.at n=20A284427
• Number of partitions of 2n into exactly n nonzero decimal palindromes.at n=46A319454