19447

Properties

Appears in sequences

• Number of paraffins.at n=42A005998
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 76 ones.at n=30A031844
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-2)/2.at n=16A047182
• Starting index of a string of 4 or more consecutive equal digits in decimal expansion of Pi.at n=18A049516
• Starting index of a string of 5 or more consecutive equal digits in decimal expansion of Pi.at n=3A049517
• Starting index of a string of exactly 5 consecutive equal digits in decimal expansion of Pi.at n=1A049521
• T(n,k)=S(2n+1,n-1,k-1), 0<=k<=n, n >= 0, array S as in A050157.at n=43A050161
• T(n,k)=S(2n+3,n+3,k+3), 0<=k<=n, n >= 0, array S as in A050157.at n=34A050164
• Primes or negative values of primes in the sequence b(n) = 47*n^2 - 1701*n + 10181, n >= 0.at n=41A050267
• Sum of binary numbers with n 1's and one (non-leading) 0.at n=10A059673
• Numbers n such that 2*(10^n-1)/3+(10^(n-1)+1) or (69*10^(n-1)+3)/9 is a plateau or depression prime.at n=9A082714
• Starting positions of strings of three 9's in the decimal expansion of Pi.at n=20A083642
• Starting positions of strings of four 9's in the decimal expansion of Pi.at n=6A083643
• Primes p such that the sum of the digits of p is not prime, but the sum of the cubes of the digits of p is prime.at n=33A091365
• Beginning with 3, least prime such that concatenation of first n terms and its digit reversal both are primes.at n=22A113584
• Primes for which the weight as defined in A117078 is 11 and the gap as defined in A001223 is 10.at n=24A119596
• a(n) is the smallest integer k such that the n-th (forward) difference of the partition sequence A000041 is positive from k onwards.at n=33A119712
• a(n) = C(n,7)-1.at n=10A124090
• Primes of the form 47*n^2 - 1701*n + 10181.at n=20A128878
• Primes of the form 88x^2+32xy+127y^2.at n=31A140630