131681

Appears in sequences

• Expansion of 1/((1-5x)(1-11x)(1-12x)).at n=4A020569
• a(1) = 1, a(2) = 2; then a(n) = smallest number such that there are a(n-1) composite numbers between a(n) and a(n+1) exclusive.at n=21A082281
• Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=8.at n=44A143451