26040

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/29 ).at n=31A011939
• tan(tan(x)*arcsin(x))=2/2!*x^2+12/4!*x^4+430/6!*x^6+26040/8!*x^8...at n=4A012378
• arctanh(tan(x)*arcsin(x))=2/2!*x^2+12/4!*x^4+430/6!*x^6+26040/8!*x^8...at n=4A012383
• Expansion of (theta_3(z)*theta_3(19z) + theta_2(z)*theta_2(19z))^4.at n=32A028644
• Base 6 digits are, in order, the first n terms of the periodic sequence with initial period 3,2,0.at n=5A037669
• Number of ways to place 3n nonattacking kings on a 6 X 2n chessboard.at n=4A061594
• Numbers k such that sigma(k) - usigma(k) is a square and sets a new record for such squares.at n=26A063840
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,9.at n=22A064241
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,27.at n=10A064250
• Sums of groups in A075643.at n=33A075645
• LCM of terms in periodic part of continued fraction expansion of square root of 1+3^n.at n=8A077634
• Numbers that can be expressed as the difference of the squares of primes in exactly eight distinct ways.at n=3A092004
• Numbers n such that sigma(n) = 16*phi(n).at n=1A104903
• Numbers k such that 1*k + 1, 3*k + 1, 9*k + 1, 27*k + 1 are all primes.at n=24A112041
• Numbers k such that prime(k) +/- k and prime(k) +/- 2k are all primes.at n=6A112530
• Expansion of e.g.f.: exp(t*x)/(1 - x/t - t^2 * x^2).at n=55A158706
• a(n) = (n-5)*(n-6)*(n-7)*(n-16)/24.at n=29A167543
• Multiples of 840.at n=31A169827
• Triangle T_3(n, m), the number of surjective multi-valued functions from {1, 1, 1, 2, 3, ..., n-2} to {1, 2, 3, ..., m} by rows (n >= 1, 1 <= m <= n).at n=34A172107
• Numbers with exactly 64 divisors.at n=27A172443