39608

Appears in sequences

• All 81 combinations of prefixing and following a(n) by a single digit are nonprime.at n=28A032734
• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes allowed).at n=6A032736
• Composite numbers k such that all the decimal concatenations ik and ikj (i, j = 1...9) are also composite.at n=18A032737
• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes and suffixes are allowed).at n=4A032738
• Smallest possible largest element in a 5 by n average array where repetitions are allowed without diagonals.at n=6A195748
• Smallest possible largest element in an 8 by n average array where repetitions are allowed without diagonals.at n=3A195751
• Number of n X 3 0..1 arrays with each 1 adjacent to 1, 2 or 3 king-move neighboring 1s.at n=5A296683
• Number of nX6 0..1 arrays with each 1 adjacent to 1, 2 or 3 king-move neighboring 1s.at n=2A296686
• T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 1, 2 or 3 king-move neighboring 1s.at n=30A296688
• T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 1, 2 or 3 king-move neighboring 1s.at n=33A296688
• G.f. A(x) satisfies: A(x) = x + x^2 + x^3 + x^4 * (1 + A(A(x))).at n=16A308031
• Number of integer compositions of n with all parts > 1 that are not the first sums of any composition.at n=24A391681