22891

Appears in sequences

• Coordination sequence for MgNi2, Position Mg1.at n=37A009936
• Number of partitions of n into parts not of the form 17k, 17k+4 or 17k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 7 are greater than 1.at n=41A035965
• Numbers k such that sigma(k+1)+sigma(k) = sigma(2k+1).at n=5A067171
• Numbers k such that (sigma(k)+sigma(k+1))/sigma(2*k+1) is an integer, where sigma = A000203.at n=11A091287
• Duplicate of A067171.at n=5A091288
• 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, 0, 0), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.at n=8A149630
• Number of binary strings of length n with equal numbers of 00010 and 00100 substrings.at n=15A164211
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S - S^2)^2.at n=11A291253
• Signed recurrence over enriched r-trees: a(n) = (-1)^n + Sum_y Product_{i in y} a(y) where the sum is over all integer partitions of n - 1.at n=22A301470
• Numbers k such that 351*2^k+1 is prime.at n=34A323032
• a(n) = Sum_{i = 1..n} 2^(n - i) * A000002(i).at n=14A329361
• Odd composite numbers k all of whose divisors larger than 1 are not binary palindromes (A006995) such that the divisors of the binary reversal of k (A030101) are the binary reversals of the divisors of k.at n=4A331664