172321

Properties

Appears in sequences

• a(n) = C(n-2,2)+C(n-5,5)+...+C(n-(3*floor((n-3)/3)+2),3*floor((n-3)/3)+2).at n=28A101551
• Primes equal to an octagonal number plus 1.at n=36A285792
• Prime numbers p such that 3*p - 2 is the square of a prime number.at n=35A289135
• a(n) = Sum_{k=0..floor(n/3)} binomial(n+3*k,n-3*k).at n=14A373905
• Expansion of (1 + x)^2/(1 - x^3*(1 + x)^3).at n=26A375321
• Number of integer compositions of n whose maximal runs R all satisfy length(R) >= first(R).at n=33A389509
• Prime numbersat n=15695