18800

Appears in sequences

• Numbers k that divide the (left) concatenation of all numbers <= k written in base 11 (most significant digit on left).at n=26A029480
• Schoenheim bound L_1(n,5,4).at n=35A036832
• Denominators of convergents to A058914.at n=22A048818
• Open 3-dimensional ball numbers (version 3): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,1/2,0).at n=33A053595
• First of triples of consecutive happy numbers, i.e., the first of three consecutive integers each of which is a happy number (A007770).at n=20A072494
• Triangular array related to tennis ball problem, read by rows.at n=60A079521
• Cascadence of (1+2x)^2; a triangle, read by rows of 2n+1 terms, that retains its original form upon convolving each row with [1,4,4] and then letting excess terms spill over from each row into the initial positions of the next row such that only 2n+1 terms remain in row n for n>=0.at n=27A120914
• Totally multiplicative sequence with a(p) = 9p+2 for prime p.at n=19A166676
• Sums of two successive primes s such that s+-3 are primes.at n=34A179485
• The n-th derivative of exp(2*arctan(x) - Pi/2), evaluated at x=1.at n=10A189772
• Number of rich binary words of length n.at n=15A216264
• The hyper-Wiener index of the nanostar dendrimer NS[n], defined pictorially in the Wang-Hua reference.at n=1A221005
• Number of length n+5 0..1 arrays with at most one downstep in every n consecutive neighbor pairs.at n=41A255996
• Growth series for group with presentation < S, T : S^4 = T^4 = (S*T)^4 = 1 >.at n=11A298802
• Number of integer partitions of n of odd rank.at n=40A340692
• Expansion of e.g.f. log(1 - log( sqrt(1-2*x) )).at n=7A363115
• Difference between larger and smaller term of n-th psi-amicable pair, sorted by the smaller members from A323329.at n=30A387643
• Conductor of elliptic curve y^2 = x^3 + n*x + n.at n=4A387834