22871

Properties

Appears in sequences

• a(0) = 1, a(n) = 21*n^2 + 2 for n>0.at n=33A010011
• 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, 1), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.at n=10A148673
• 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, 0, -1), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.at n=8A150218
• Number of distinct values taken by 6th derivative of x^x^...^x (with n x's and parentheses inserted in all possible ways) at x=1.at n=15A199883
• Numerators of s(i) = s(i-1) - (1/i)*sign(s(i-1)) with s(1) = 1.at n=12A203810
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the open interval (-n,n).at n=17A211032
• Primes p such that p^4 + p + 1 and p^4 - p - 1 are also prime.at n=18A236073
• Total number of congruence subgroups of PSL(2,Z) of genus n.at n=14A258691
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=13A316547
• Euler transform of j-> ceiling(2^(j-2)).at n=14A347011
• Primes p such that if q is the next prime, p+A004086(q) and q+A004086(p) are prime.at n=21A351728
• First of three consecutive primes p,q,r such that p+q, p+r and q+r are all triprimes.at n=9A362203
• Prime numbersat n=2554