26159

Appears in sequences

• Numbers k that divide the sum of the digits of k!!, the double factorial of k.at n=15A108858
• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=0, k=1 and l=1.at n=10A176610
• Sequence with a (1,-1) Somos-4 Hankel transform.at n=11A178078
• Divisors of the repunit 111111111111 = A002275(12).at n=45A197318
• Number of ballot sequences of length n having exactly seven descents.at n=2A241800
• Number of ballot sequences of length 2n having exactly n descents.at n=7A241804
• Least positive integer k such that prime(prime(k)), prime(prime(k*n)), prime(p) and prime(q) form a 4-term arithmetic progression for some pair of primes p and q.at n=14A261462
• a(n) = (n+1)^3 - n^2.at n=29A261893
• Number of partitions of n that contain exactly one isolated singleton.at n=16A303587
• Number of 4-element subsets of [n] having a prime element sum.at n=39A320679
• Numbers of the form prime(w)*prime(x)*prime(y) with w >= x >= y such that 2w = 3x + 4y.at n=34A358102