24010

Appears in sequences

• Triangle of coefficients in expansion of (2 + 7*x)^n.at n=19A013623
• Numbers of form 7^i*10^j, with i, j >= 0.at n=16A025632
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*2^j.at n=16A038268
• Numbers n such that n | 7^n + 6^n + 5^n + 4^n + 3^n + 2^n + 1^n.at n=45A056750
• Multiples of 7 whose sum of digits is equal to 7.at n=37A063416
• Numbers divisible by the cube of the sum of their digits in base 10.at n=29A072082
• Numbers divisible by the 4th power of the sum of their digits in base 10.at n=10A072083
• a(n) = n^4*(n^4-1)/240.at n=7A078876
• 5-Smith numbers.at n=8A103126
• a(n) = J_4(n)/240.at n=43A115002
• Triangle read by rows, giving Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).at n=39A123354
• a(n) = (2*n^3 + 5*n^2 + 7*n)/2.at n=27A162264
• Totally multiplicative sequence with a(p) = 3p+1 for prime p.at n=47A166661
• Fibonacci sequence beginning 13, 7.at n=17A206611
• Numbers k such that digital root of k equals largest prime factor of k.at n=30A209192
• Number of 2 X 2 matrices with all terms in {0,1,...,n} and even determinant.at n=13A210369
• Number of 2 X 2 matrices having all terms in {1,...,n} and even determinant.at n=13A211064
• Numbers k such that the sum of prime factors of k (counted with multiplicity) equals five times the largest prime divisor of k.at n=16A212863
• Sequence A261220 shown in factorial base: a(n) = A007623(A261220(n)).at n=45A260743
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having index change +-(.,.) 0,0 0,1 or 2,-2.at n=18A264090