87380

Appears in sequences

• a(n) = a(n-1) + 2*a(n-2) + 2, for n>=3, where a(0)= 1, a(1)= 2, a(2)= 4.at n=16A026644
• Totient of 2^n+1.at n=17A053285
• Number of degree-n irreducible polynomials over GF(4) with trace 0 and subtrace 1.at n=11A074032
• Number of degree-n irreducible polynomials over GF(4) with trace 1 and subtrace 0.at n=11A074033
• Number of degree-n irreducible polynomials over GF(4) with trace 1 and subtrace 1.at n=11A074034
• Let a = RootOf( x^2+x+1 ) and b = 1+a. Number of degree-n irreducible polynomials over GF(4) with trace 1 and subtrace a.at n=11A074035
• Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 0.at n=11A074406
• Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 1.at n=11A074407
• Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 2.at n=11A074408
• Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 3.at n=11A074409
• Number of 4-ary Lyndon words of length n over GF(4) with trace 1 and subtrace 0.at n=11A074448
• Number of 4-ary Lyndon words of length n over GF(4) with trace 1 and subtrace 1.at n=11A074449
• Let x = RootOf(z^2 + z + 1) and y = 1+x. Number of 4-ary Lyndon words of length n over GF(4) with trace 1 and subtrace x.at n=11A074450
• a(n) = Sum_{j=1..n} phi(n)^j.at n=7A075490
• Partial sums of Jacobsthal gap sequence.at n=16A080610
• a(n) = (4/3)*(4^n - 1).at n=8A080674
• a(n) = -5*a(n-1) - 4*a(n-2), a(0)=1, a(1)=0.at n=9A084240
• Expansion of x*(1+2*x)/((1+x)*(1-x)*(1-2*x)).at n=16A084639
• Expansion of (1+x-4*x^2) / ((1+x)*(1-4*x^2)).at n=17A087213
• a(1) = 4; then alternately add -4 and multiply by -2.at n=33A096406