33138

Appears in sequences

• 12-gonal (or dodecagonal) pyramidal numbers: a(n) = n*(n+1)*(10*n-7)/6.at n=27A007587
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 26.at n=13A031704
• Numbers whose set of base-13 digits is {1,2}.at n=38A032933
• Numbers k such that (11*13^k -1)/2 is prime.at n=21A057471
• Starting numbers for which the RATS sequence has eventual period 3.at n=22A114613
• a(n) = 676*n^2 + 2*n.at n=6A158385
• a(n) = 196*n^2 + 14.at n=13A158555
• a(n) = 169*n^2 + n.at n=13A173275
• a(n) = 2*n*A071148(n).at n=20A177082
• G.f.: exp( Sum_{n>=1} A056789(n)*x^n/n ), where A056789(n) = Sum_{k=1..n} lcm(k,n)/gcd(k,n).at n=17A226455
• Irregular table read by rows: The number of k-faced polyhedra, where k>=4, created when an n-antiprism, formed from two n-sided regular polygons joined by 2n adjacent alternating triangles, is internally cut by all the planes defined by any three of its vertices.at n=56A338808
• Number of convex polygons on the lines of a triangular grid with edge length n.at n=12A340130
• Total number of peaks in 2-Fuss-skew paths of semilength n.at n=4A361964