381990

Appears in sequences

• Number of nonsquare rectangles on an n X n board.at n=34A052149
• At these values of k, the 1st, 2nd, 3rd and 4th cyclotomic polynomials all give prime numbers.at n=25A070025
• 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), (1, 0, -1), (1, 0, 1), (1, 1, 1)}.at n=9A150965
• a(n) = 3*a(n-3) + a(n-2), a(0)=3, a(1)=0, a(2)=2.at n=25A231101
• Products of 6 distinct primes that are sandwiched between twin prime numbers.at n=18A378097