55981

Appears in sequences

• Expansion of 1/(1-x^3-x^4-x^5-x^6-x^7-x^8-x^9).at n=34A017822
• Strong pseudoprimes to base 55.at n=19A020281
• Smallest k such that trinomial x^A001153(n) + x^k + 1 over GF(2) is primitive.at n=28A074743
• Number of connected ordered 2-element multiantichains on a labeled n-set.at n=10A094729
• 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), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.at n=8A150810
• Positive numbers y such that y^2 is of the form x^2+(x+119)^2 with integer x.at n=36A156650
• Smallest palindromic numbers of length 4 in two bases differing by n.at n=18A216843
• Smallest number that can be written in exactly n ways as sum of two quarter-squares.at n=26A240952