-271

Appears in sequences

• Expansion of tanh(sin(tan(x))).at n=4A009792
• a(n) = -a(n-1) - a(n-2) + a(n-3), a(0)=0, a(1)=0, a(2)=1.at n=23A057597
• Signed distance of primes from LCM(1,...,x) being closest to it. Arguments x were selected from A000961 (powers of primes including primes) in order to use distinct values of LCM exactly once. When both closest primes are in the same distance, then negative were used.at n=49A058030
• Expansion of (1-x-x^N)/((1-x)(1-x^2)(1-x^3)...(1-x^N)) for N = 6.at n=28A060025
• a(1) = 1, a(2n) = a(2n-1) + c(n) and a(2n+1) = a(2n) - p(n), where c(n)=A002808(n) and p(n)=A000040(n) are the n-th composite and n-th prime numbers, respectively.at n=40A073891
• Inverted (definition in A075193) generalized tribonacci numbers A001644.at n=16A075298
• Expansion of 1/((1-x)*(1+x+2*x^2+x^3)).at n=28A077913
• Abundance values of numbers whose abundance is (+-1) times a prime.at n=16A088006
• Diagonal sums of the Fibonacci related number triangle A110314.at n=32A110315
• Row sums of a number triangle related to the Pell numbers.at n=16A110331
• Diagonal sums of number a triangle related to the Pell numbers.at n=32A110332
• Determinants of 3 X 3 matrices of continuous blocks of 9 consecutive semiprimes.at n=13A118781
• Expansion of q^(-3/8)* eta(q)^7* eta(q^4)^2/ eta(q^2)^3 in powers of q.at n=38A128713
• Triangle read by rows, T[n,2i-1]=2T[n-1,i],T[n,2i]=2k-1-2T[n-1,i].at n=12A138583
• Define E(n) = Sum_{k>=0} (-1)^floor(k/3)*k^n/k! for n = 0,1,2,... . Then E(n) is an integral linear combination of E(0), E(1) and E(2). This sequence lists the coefficients of E(1).at n=7A143629
• Numerator of Hermite(n, 11/28).at n=2A160195
• a(0)=1, a(1)=1; thereafter a(n) = -a(n-1) - 2*a(n-2).at n=15A169998
• A (4,-5) Somos-4 sequence.at n=5A171422
• A (1,1) Somos-4 sequence associated to the elliptic curve E: y^2 + x*y - y = x^3 - x^2 + x and point (0,0).at n=13A178627
• Diagonal sums of generalized Narayana triangle A180957.at n=14A180958