19737

Appears in sequences

• All 81 combinations of prefixing and following a(n) by a single digit are nonprime.at n=8A032734
• Denominators of continued fraction convergents to sqrt(315).at n=8A041595
• Denominators of continued fraction convergents to sqrt(733).at n=5A042411
• a(n) = Sum_{d|3} phi(d)*n^(3/d).at n=27A054602
• Numbers n such that 5*10^n + 3 is prime.at n=16A096254
• Number of permutations in S_n avoiding {bar 5}2143 (i.e., every occurrence of 2143 is contained in an occurrence of a 52143).at n=8A137545
• a(n) = 6n + 3^n.at n=8A173391
• Number of n X 3 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=8A224033
• 26-gonal pyramidal numbers: a(n) = n*(n+1)*(8*n-7)/2.at n=17A256646
• Numbers k such that (14*10^k - 143)/3 is prime.at n=21A279050
• Number of numbers < 10^n in which more than half of the digits are the same.at n=5A353183
• a(n) = Sum_{k=0..floor(n/2)} n^(3*(n-2*k)) * binomial(n-k,k).at n=3A368890