19398

Appears in sequences

• a(n) = Sum_{k=0..m} T(n,k) * T(n,k+2), where m=2 for n=2 and m=n+1 for n >= 3; and T is given by A026148.at n=4A027331
• Boris Stechkin's function.at n=35A055004
• Numbers n such that x^n + x^13 + 1 is irreducible over GF(2).at n=18A057483
• S[A002808(n)] where S[] is Boris Stechkin's function (A055004) and A002808(n) are the composites.at n=24A063483
• Markoff numbers (A002559) multiplied by 3.at n=18A086326
• Sum of the areas of the first n Jacobsthal rectangles.at n=8A096978
• Number of partitions of n into parts having at most two prime-factors.at n=38A101049
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+19395) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=3A283886
• Number of ways to write n as an orderless product of orderless sums.at n=35A318949