19610

Appears in sequences

• Increasing length runs of consecutive composite numbers (starting points).at n=11A008950
• Smallest start for a run of at least n composite numbers.at n=43A030296
• Smallest start for a run of at least n composite numbers.at n=44A030296
• Smallest start for a run of at least n composite numbers.at n=45A030296
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 28.at n=9A031706
• Smallest of first string of exactly 2n-1 consecutive composite integers.at n=25A045881
• Length of hypotenuse squared in right triangle formed by a prime spiral plotted in Cartesian coordinates.at n=25A048851
• First subsequent, disjoint occurrence of n consecutive nonprimes.at n=38A060064
• a(n) = prime(n+1)^2 + prime(n)^2.at n=24A069484
• a(n+1) = a(n) + (if a(n) is odd then (next odd square) else (next even square)), a(0) = 1.at n=25A116955
• a(n) = 100*n^2 + 10.at n=14A158492
• G.f.: exp( Sum_{n>=1} 2*sigma(n*5^n)*x^n/n ).at n=4A193104
• Triangle of coefficients of polynomials u(n,x) jointly generated with A210756; see the Formula section.at n=42A210755
• Numbers that can be represented as a sum of two distinct nontrivial prime powers in three or more ways.at n=21A225104
• Numbers which are the sum of two squared primes in exactly four ways (ignoring order).at n=5A226599
• Numbers k that are the product of four distinct primes such that x^2+y^2 = k has integer solutions.at n=33A248712
• Numbers divisible by prime(d) for each digit d in their base-7 representation, none of which may be zero.at n=48A256877
• a(n) is the smallest positive integer that begins a run of exactly 2*n-1 consecutive integers having at least 4 divisors each.at n=25A340735
• a(n) = Sum_{k=1..n} sigma(n*k).at n=25A372710
• a(n) is the smallest even number m such that the set {m+1, m+3, m+5, ..., m+(2*n-1)} contains no prime numbers.at n=21A383969