31981

Properties

Appears in sequences

• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 1, 1), (1, 0, 1), (1, 1, -1), (1, 1, 1)}.at n=7A151232
• a(n) = 1 + n*(n+1)*(n-1)/2.at n=40A158842
• Primes of the form p=floor(T/6), T are triangular numbers.at n=32A171595
• Primes of the form 6n^2 + 7.at n=30A201601
• Number of (w,x,y,z) with all terms in {1,...,n} and w^3<=x^3+y^3+z^3.at n=14A212098
• a(n) = gpf(lpf(2^prime(n) - 1) - 1) where prime(n) is the n-th prime.at n=28A292238
• Prime numbersat n=3431