123983

Properties

Appears in sequences

• a(n) = Sum_{k=0..n} binomial(2^k + n-k-1, n-k); equals the row sums of triangle A137153.at n=9A137154
• Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=6.at n=37A143449
• The first of three consecutive primes the sum of which is equal to the sum of three consecutive heptagonal numbers.at n=8A298302
• Prime numbersat n=11649