45541

Properties

Appears in sequences

• Number of 2 up, 2 down, 2 up, ... permutations of length 2n + 1.at n=5A005981
• Numbers k such that 51*2^k+1 is prime.at n=39A032375
• The 2-Up sequence: formed from final entries in rows of A058257.at n=11A058258
• 2 up, 2 down, ..., 2 up, 2 down, 2 up permutations of length 4n+3.at n=2A131454
• 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), (-1, 1, 1), (1, 0, 0), (1, 0, 1), (1, 1, -1)}.at n=8A150534
• Primes p such that the multiplicative order of 2 modulo p is (p-1)/11.at n=20A152311
• a(n) = 1 + n*(n+1)*(n-1)/2.at n=45A158842
• Number of nX3 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to 2.at n=20A197056
• Primes formed by concatenating palindromes having even number of digits with 1.at n=15A210534
• Fundamental discriminants d uniquely characterizing all complex biquadratic fields Q(sqrt(-3),sqrt(d)) which have 3-class group of type (3,3) and second 3-class group isomorphic to either SmallGroup(2187,247)-#1;5 or SmallGroup(2187,247)-#1;9.at n=15A250242
• Primes having only {1, 4, 5} as digits.at n=23A260268
• Prime numbersat n=4721