26779

Appears in sequences

• Number of partitions of n into parts not of the form 21k, 21k+9 or 21k-9. Also number of partitions with at most 8 parts of size 1 and differences between parts at distance 9 are greater than 1.at n=39A035987
• Indices of prime numbers in A001129.at n=18A101759
• G.f.: A(x) = ( G(x)^5 - G(x^5) - 5*x*((1-x^4)/(1-x))/(1-x^5) )/(25*x^2) where G(x) is the g.f. of A110631.at n=17A111583
• Integers k such that 10^k + 87 is a prime number.at n=11A135117
• Euler transform of Pell numbers.at n=11A261329