28269

Appears in sequences

• Number of even non-cototients not exceeding 2^n.at n=17A072297
• 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, 1), (0, 1, -1), (0, 1, 0), (1, 0, 1)}.at n=8A150281
• Number of permutations of length n which avoid the patterns 1243 and 2341.at n=9A165536
• Composite numbers and 1 which yield a prime whenever a 7 is inserted anywhere in them, including at the beginning or end.at n=38A216168