20718

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite YUG = Yugawaralite Ca2[Al4Si12O32].8H2O starting at a T1 atom.at n=13A019264
• (Sum of digits of n)^4 - (sum of digits of n^4).at n=39A069978
• Interprimes which are of the form s*prime, s=18.at n=35A075293
• Index of the first occurrence of prime(n) in A060324.at n=24A078454
• Numbers k such that 5*10^k - 7 is prime.at n=16A103002
• a(n) = digit reversal of A103741(n).at n=28A103763
• a(n) = digit reversal of A103764.at n=9A103837
• a(n) = 64*n^2 - n.at n=17A157948
• a(n) = 256*n^2 - 2*n.at n=8A158249
• a(n) = 324*n^2 - 18.at n=7A158589
• G.f. satisfies: A(x) = Sum_{n>=0} x^n*A(x)^(6*n^2).at n=5A191804
• Number T(n,k) of solid standard Young tableaux of n cells and height = k; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=49A214753
• Numbers n such that for some m, A166133(m)=n, A166133(m+1)=n^2-1, in increasing order.at n=35A256407
• Number of solid standard Young tableaux of n cells and height four.at n=5A273584
• Numbers n such that A277118(n) = 15.at n=5A277512
• Numbers k such that (68*10^k + 1)/3 is prime.at n=22A281296
• Expansion of Sum_{i>=0} x^(2^i)/(1 - x^(2^i)) / Product_{j>=0} (1 - x^(2^j)).at n=52A281688
• 'Geobonnaci' sequence: a(1)=a(2)=1, thereafter a(n) = round( 2 * sqrt(a(n-1) * a(n-2)) ).at n=22A322332
• a(n) is the number of regions formed by n-secting the angles of a nonagon (enneagon).at n=35A335781