131221

Properties

Appears in sequences

• Summarize the previous term! (in decreasing order).at n=5A007890
• Primes with digital product = 12.at n=31A107697
• Primes of the form 5k^2 + 1.at n=10A137530
• 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, 0, 0), (0, -1, 1), (1, -1, 0), (1, 0, -1), (1, 1, 0)}.at n=10A149334
• The smallest of four consecutive primes with prime gaps {a,b,c} = {10,18,2}.at n=19A215719
• a(n) = Sum_{k=1..A003056(n)} 2^(T(n,k)-1), where T(n,k) = k-th term in row n of A235791.at n=17A348473
• Primes p such that the multiplicative order of 3 modulo p is 2 times a power of 3.at n=12A367649
• Prime numbersat n=12261