36186

Appears in sequences

• All 81 combinations of prefixing and following a(n) by a single digit are nonprime.at n=24A032734
• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes allowed).at n=4A032736
• Composite numbers k such that all the decimal concatenations ik and ikj (i, j = 1...9) are also composite.at n=17A032737
• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes and suffixes are allowed).at n=3A032738
• a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(2) = 4.at n=36A050039
• Sum of terms of n-th group in A075383.at n=36A075386
• Number of compositions of n with exactly 5 transitions between different parts.at n=9A244717
• Face-centered cubic pyritohedral numbers: a(n) = 3456*n^3 - 8424*n^2 + 6848*n - 1854.at n=2A391167