20445

Appears in sequences

• Expansion of (1-x^5) / (1-x)^5.at n=29A008487
• Terms of A050530 with four prime divisors.at n=9A053340
• Numbers k such that 5*3^k + 2 is prime.at n=35A058590
• Numbers n for which there are exactly six k such that n = k + (product of nonzero digits of k).at n=15A096927
• Matrix cube-root of triangle A107717.at n=40A107719
• Numbers n such that (n / sum of digits of n) is a golden semiprime.at n=12A108780
• First trisection of A061037 (Balmer line series of the hydrogen atom).at n=47A142590
• a(n) = (8*n+5)*(8*n+9).at n=17A146302
• 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, 0), (-1, 0, 1), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.at n=8A149636
• Quintisection A061037(5*n-2).at n=29A174850
• Heinz numbers of integer partitions whose reciprocal sum is 1.at n=14A316855
• Heinz numbers of aperiodic integer partitions into relatively prime parts whose reciprocal sum is 1.at n=6A316888
• Heinz numbers of aperiodic integer partitions whose reciprocal sum is 1.at n=10A316889
• Heinz numbers of integer partitions into relatively prime parts whose reciprocal sum is 1.at n=6A316890
• Heinz numbers of integer partitions into relatively prime parts whose reciprocal sum is the reciprocal of an integer.at n=11A316901
• Expansion of Sum_{k>0} (x * (1 + 2 * x^k))^k.at n=59A360756
• Truncated centered square numbers: a(n) = 14*n^2 - 22*n + 9.at n=38A389928