30791
domain: N
Appears in sequences
- (prime(n)*(prime(n+1)-1) + (prime(n)-1)*prime(n+1)) / 2.at n=38A099909
- Integers k such that 10^k - 27 is prime.at n=20A108329
- Numerators of row sums of array of ratios A111879(n,k)/A111880(n,k).at n=8A111881
- Numerator of q_n = -4*n + 2*(1+n)*HarmonicNumber(n).at n=10A115107
- Number of binary words of length n containing at least one subword 10001 and no subwords 10^{i}1 with i<3.at n=32A143283
- Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.at n=9A146151
- [(1+e^n)/(1+e*n)], where [ ]=floor.at n=13A191693
- Expansion of x^6/((1 - x)^2*(1 - 2*x + x^3 - x^4)).at n=14A290986
- a(n) = numerator of AM(n)-HM(n), where AM(n) and HM(n) are the arithmetic and harmonic means of the first n positive integers.at n=9A368372