19223

Appears in sequences

• Positions of 4-digit terms in the continued fraction for Pi (3 is at position 0).at n=16A048959
• Expansion of e.g.f.: 1/(exp(x) - x).at n=9A089148
• Composite numbers generated by the Euler polynomial x^2 + x + 41.at n=25A145292
• Numerator of Laguerre(n, -3).at n=6A160613
• a(n) = 20*n^2 + 3.at n=30A167573
• Numbers k such that 2^k - 127 is prime.at n=7A169716
• Prime-generating polynomial: a(n) = 16*n^2 - 300*n + 1447.at n=44A181973
• a(n) is the number of digits in the decimal representation of the smallest power of n that contains nine consecutive identical digits.at n=21A217184
• Semiprimes generated by the Euler polynomial x^2 + x + 41.at n=25A228183
• Number of compositions of n whose standard factorization into Lyndon words has all distinct weakly increasing factors.at n=17A299027
• a(n) is the number of subsets of the divisors of k which sum to k+1 where k is a number all of whose prime divisors are consecutive primes starting at 2.at n=37A359753