219131

Appears in sequences

• Composite numbers whose prime factors contain no digits other than 1 and 8.at n=19A036308
• Reverse(Prime(n)) concatenated with Prime(n) (a palindrome) is divisible by n.at n=3A085017
• Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=6A317260
• Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=6A317265
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UH and HD.at n=19A329702
• Number of ways to choose a set partition of the parts of a strict integer composition of n.at n=21A336140
• Expansion of 1/( 1 - Sum_{k>=0} x^(4^k) / (1 - x^(4^k)) ).at n=18A382372