305809
domain: N
Appears in sequences
- Composite numbers whose prime factors have no digits other than 7's and 9's.at n=32A036324
- a(n) = n^4 - 2*n^3 + 3*n^2 - 2*n + 1, the Alexander polynomial for reef and granny knots.at n=24A058031
- Number of meaningful differential operations of the n-th order on the space R^7.at n=17A090992
- Odd squares not in A113659.at n=24A103962
- Squares representable as k*m + k + m, where k >= m > 1 are squares.at n=31A256074
- Discriminants with exactly 2 associated cyclic cubic fields.at n=18A343002
- Discriminants with at least 2 associated cyclic cubic fields.at n=18A343024