30046

Appears in sequences

• Numbers k that divide the sum of the first k composite numbers.at n=14A053781
• a(0)=a(1)=1. For n >= 2, if a(n-1) is coprime to n, then a(n) = a(n-1) + a(n-2). Otherwise, a(n)=1.at n=56A139047
• 4*P_5(n), 4 times the Legendre Polynomial of order 5 at n.at n=4A160737
• Numbers k such that the first 9 digits of the k-th Lucas number are 1-9 pandigital.at n=8A216489
• Irregular triangular array T(n,k) of consecutive composites.at n=43A226085
• Expansion of Product_{k>=1} (1/(1 - 2*x^k))^k.at n=11A261561
• Number of permutations p of [n] such that | |p(i) - p(i-1)| - |p(i+1) - p(i)| | = 1.at n=20A338766
• Numbers k such that A003415(k) >= A276086(k) and gcd(k, A003415(k)) = gcd(k, A276086(k)), where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function.at n=23A369959
• Numbers k such that (A276086(k)/s)^s >= k^(s-1) and A276086(k) <= A003415(k), where A003415 is the arithmetic derivative, A276086 is the primorial base exp-function, and s = bigomega(k).at n=24A370128