31248

Appears in sequences

• a(n) is the concatenation of n and 8n.at n=30A009470
• cosh(arctan(x)*arctan(x))=1+12/4!*x^4-480/6!*x^6+31248/8!*x^8...at n=4A012465
• E.g.f.: x^3*(exp(x)-1)^2.at n=9A052769
• a(n) is both the sum of n+1 consecutive integers and the sum of the n immediately higher consecutive integers.at n=31A059270
• Numbers that are divisible by all of their 1 and 2 digit substrings.at n=35A063527
• Number of palindromes (in base 5) below 5^n.at n=11A117864
• A001263 * A128064 (unsigned).at n=48A136534
• Smallest number having exactly n divisors that are contained in its decimal representation.at n=11A155005
• Number of isomorphism classes of connected (D_4)-fold coverings of a connected graph with circuit rank n.at n=5A160873
• a(n) = ((2^b-1)/phi(n))*Sum_{d|n} Moebius(n/d)*d^(b-1) for b = 6.at n=3A160896
• Numbers n such that n^2 can be represented as sum of (at least two) consecutive cubes and n is not a triangular number.at n=30A163393
• Sequence A154692 adjusted to leading one:t(n,m)=A154692(n,m)-A154692(n,0)+1.at n=37A174667
• Sequence A154692 adjusted to leading one:t(n,m)=A154692(n,m)-A154692(n,0)+1.at n=43A174667
• Number of 4-step king's tours on an n X n board summed over all starting positions.at n=10A186863
• The least common multiple of a perfect number (A000396) and its arithmetic derivative (A003415).at n=2A189410
• Numbers k that divide the base-5 reversal of k.at n=17A222816
• Numbers, a(n) where binomial(a(n), 5n-1) == 0 (mod 5) and binomial(a(n), k) != 0 (mod 5) for k != 5n - 1.at n=20A224251
• The Wiener index of the cyclic phenylene with n hexagons (n>=3).at n=11A224456
• Number of pairs (x, y) with 0 <= x, y <= n such that the distance between two points is a positive integer.at n=26A228108
• The stonemason's problem: numbers n such that n^2 is the sum of more than three consecutive cubes, the cube 1 being disallowed.at n=31A238099