18459

Appears in sequences

• Partial sums of the partition numbers A000041 of the positive integers.at n=27A026905
• Numbers k such that 107*2^k+1 is prime.at n=10A032403
• Numbers k such that 227*2^k+1 is prime.at n=14A032490
• Numerators of continued fraction convergents to sqrt(439).at n=5A041836
• Trajectory of 19 under the `19x+1' map.at n=15A057685
• Let p(k) be the number of partitions of k (A000041); a(n) = Sum_{1<=k<=n, gcd(k,n)=1} p(k).at n=28A096223
• Sum of squares of three consecutive primes.at n=20A133529
• Sums s of squares of three consecutive primes, such that s-+2 are primes.at n=2A164130
• Number of 4 X 4 X 4 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.at n=35A166212
• Number of 6-element subsets of {1, 2, ..., n} having pairwise coprime elements.at n=23A186982
• Column 4 of array in A226513.at n=8A226741
• a(n) = Sum_{i=0..n} digsum_7(i)^3, where digsum_7(i) = A053828(i).at n=57A231678
• a(n) = A106184(n) / A001316(n).at n=9A268433
• Partial sums of A299279.at n=19A299280
• Numbers k such that 8k+1, 12k+1 and 24k+1 are primes and the last two are also of the form x^2 + 27y^2, so the tetrahedral number T(24k+1) is a Fermat pseudoprime to base 2.at n=11A321867
• Expansion of Sum_{k>0} x^(3*k)/(1+x^k)^4.at n=48A363617