131066
domain: N
Appears in sequences
- Binomial transform of [1,1,7,1,7,1,7,1,...].at n=15A131130
- 2^n - number of digits of 2^n.at n=17A139817
- Expansion of (1+2x)*(1+2*x^2)/((1-x)*(1+x)*(1-2*x^2)).at n=29A185647
- a(n) = 2*a(n-1) + a(n-2) - 2*a(n-3) for n>2, a(0)=-1, a(1)=-2, a(2)=-4.at n=18A254076
- Decimal representation of the n-th iteration of the "Rule 227" elementary cellular automaton starting with a single ON (black) cell.at n=8A267847
- a(n) = 2^(n-1) - tau(n) where tau(n) is the number of divisors of n.at n=17A349094
- Positions of powerful terms among the numbers satisfying Euler's condition for odd perfect numbers (A228058).at n=27A388279