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 A206821 Numbers that match irreducible polynomials over {-1,0,1} with leading coefficient 1. 9
 2, 3, 7, 8, 10, 14, 16, 18, 21, 23, 29, 31, 35, 41, 42, 44, 48, 50, 54, 56, 60, 62, 66, 70, 72, 76, 78, 80, 82, 84, 86, 88, 93, 97, 99, 103, 109, 111, 115, 117, 123, 125, 129, 131, 137, 141, 143, 147, 153, 155, 159, 161, 165, 167, 171, 173, 179, 183, 186, 188 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The monic polynomials y(n,x) having coefficients in {-1,0,1} are matched to the set N of positive integers as follows.  First, the monic polynomials p(n,x) having coefficients in {0,1} are matched to N as in A206074; i.e., the polynomial x^d(0) + x^d(1) + ... + d(n), where d(i) is 0 or 1 for 0<=i<=n and d(0)=1, matches the binary number d(0)d(1)...d(n).  Then monic polynomials having at least one negative coefficient are then inserted among the polynomials p(n,x), as follows:  x-1 goes between x and x+1, and for k>1, the polynomials x^k-p(n,x), for 0

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Last modified June 16 21:43 EDT 2021. Contains 345080 sequences. (Running on oeis4.)