51319

Appears in sequences

• Octagonal pyramidal numbers: a(n) = n*(n+1)*(2*n-1)/2.at n=36A002414
• Strong pseudoprimes to base 41.at n=24A020267
• Strong pseudoprimes to base 65.at n=25A020291
• Gaps of 10 in sequence A038593 (upper terms).at n=23A038660
• Smallest k such that d(phi(k)) - phi(d(k)) = n, where d(k) = A000005(k) and phi(k) = A000010(k).at n=44A078150
• Numbers k such that phi(k) is a perfect sixth power.at n=30A078166
• a(n) = (n+1)*(2*n+1)*(4*n+1).at n=18A079588
• a(n) = Sum_{k=0..floor(n/5)} C(n-4k,k+1).at n=37A099559
• Structured icosidodecahedral numbers.at n=18A100147
• Numbers with sum of digits = 19, divisible by 19 and containing the string "19".at n=9A121669
• Number of fusenes with 22 hexagons, C_(2v) symmetry and containing n carbon atoms.at n=25A123288
• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k returns to the x-axis (1 <= k <= n).at n=46A128741
• Number of reduced words of length n in Coxeter group on 38 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.at n=3A162858
• Great rhombicosidodecahedron with faces of centered polygons.at n=9A193253
• Smallest product of three distinct primes of the form n*k+1.at n=8A193873
• Smallest product of three distinct primes of the form n*k+1.at n=17A193873
• Numbers that occur more than once in A193873, in order of appearance.at n=3A194263
• Odd octagonal pyramidal numbers.at n=18A218326
• Squarefree numbers (from A005117) with prime divisors in a 2p-1 progression.at n=11A231814
• Squarefree numbers (A005117) of the form p*q*r with prime factors p, q, r with q = 2*p-1 and r = 2*q-1.at n=1A231815