77077

Appears in sequences

• Central factorial numbers: column 2 in triangle A008956.at n=6A001823
• Triangle of central factorial numbers |4^k t(2n+1,2n+1-2k)| read by rows (n>=0, k=0..n).at n=30A008956
• Numbers having four 7's in base 10.at n=14A043520
• Composite palindromes divisible by the sum of their prime factors (counted with multiplicity).at n=10A046348
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-2)/2.at n=24A047191
• Consider sequence of fractions A066657/A066658 produced by ratios of terms in A066720; let m = smallest integer such that all fractions 1/n, 2/n, ..., (n-1)/n have appeared when we reach A066720(m) = k; sequence gives values of k; set a(n) = -1 if some fraction i/n never appears.at n=12A066848
• a(n) = (n+1)*(n+2)^2*(n+3)*(n+4)*(n+5)*(2*n+3)/720.at n=9A108681
• Start with 1 and repeatedly reverse the digits and add 38 to get the next term.at n=18A118634
• Table of the number of (n,k)-Riordan complexes, read by rows.at n=33A160563
• Second column of triangle in A182971.at n=12A181888
• Numbers whose set of base 10 digits is {0,7}.at n=27A204094
• Antidiagonal sums of the convolution array A213765.at n=14A213767
• The Wiener index of the straight pentachain of n pentagonal rings (see Fig. 2.1 in the A. A. Ali et al. reference).at n=33A224459
• a(n) = 25*binomial(n-1,6) + binomial(n-1,5).at n=10A274501
• Solutions y to x/SOD(x) = y, where x and y are palindromes.at n=10A276144
• a(n) = 7*(10^(2n+1)-1)/9 - 7*10^n.at n=2A332170
• Highly composite 7-rough numbers: numbers that are not divisible by any prime smaller than 7 and whose number of divisors reaches a record.at n=9A343737
• Abelian orders m for which there exist at least 4 groups of order m.at n=30A350323