21141

Appears in sequences

• Sorted k-factorial numbers (numbers of form k-1 excluded).at n=33A028687
• Sorted factorial and k-factorial numbers (numbers of form k-1 excluded).at n=39A028688
• Numbers whose base-2 representation has exactly 13 runs.at n=28A043580
• Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=19A046320
• Expansion of (11*x-2)/(1-3*x)^2.at n=7A053566
• Rounded total surface area of a regular dodecahedron with edge length n.at n=32A071397
• Numbers divisible by the cube of the sum of their digits in base 10.at n=26A072082
• Sum of factorials of digits of n equals the largest prime factor of n.at n=15A074257
• Numbers k such that k^2 = x^3 + y^4 with positive integers x, y.at n=30A087209
• Number of base 9 n-digit numbers with adjacent digits differing by four or less.at n=5A126504
• Composite numbers k that divide 3^k - 2^k - 1, excluding powers of 2, 3 and 7.at n=33A127073
• a(n) = (n-1)^2*(n+1).at n=28A152618
• a(n) = 961*n - 1.at n=21A158412
• a(n) = 22*n^2 - 1.at n=30A158540
• T(n,k)=Number of -k..k arrays of n elements with adjacent element differences also in -k..k.at n=32A201042
• Number of -n..n arrays of 5 elements with adjacent element differences also in -n..n.at n=3A201044
• Triangle of coefficients of polynomials v(n,x) jointly generated with A209139; see the Formula section.at n=50A209140
• a(n) = 29*n^2.at n=27A244635
• Values of n such that there are exactly 7 solutions to x^2 - y^2 = n with x > y >= 0.at n=32A257414
• Number of nX6 0..2 arrays with every element equal to some element at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0) both plus 1 mod 3 and minus 1 mod 3, with new values introduced in order 0..2.at n=2A277765