23936

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 77.at n=32A031575
• Triangle of rooted planar maps.at n=58A046651
• Numbers n such that 215*2^n-1 is prime.at n=26A050859
• Lexicographically earliest increasing sequence of relatively prime numbers with nondecreasing number of divisors. a(0) = 1, tau(a(n+1)) >= tau(a(n)) and GCD(a(n),a(n+1)) = 1.at n=49A076963
• Number of (s(0), s(1), ..., s(n)) such that 0 < s(i) < 6 and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(n) = 5.at n=9A094309
• Structured snub cubic numbers.at n=15A100150
• Integers k such that 10^k - 39 is prime.at n=18A108365
• a(n) = (n+1)^2*(n+2)*(2*n+3)/6.at n=15A108678
• Numbers k such that k^3 contains a pandigital substring.at n=21A115933
• Values of z in solutions (x,y,z) to the Diophantine equation x^3-x^2+y^3-y^2=z^3-z^2, with 1<x<y<z arranged in order of increasing x.at n=24A138669
• a(n) = 2662*n - 22.at n=8A157609
• Number of ways that a tile in the form of a strip of n congruent regular hexagons stuck together on successive parallel edges can be surrounded by one layer of copies of itself in a plane. Ways that differ by rotation or reflection are not counted as different. The surrounded tile is the exact surrounded region.at n=6A159295
• Numbers with prime signature {7,1,1}, i.e., of form p^7*q*r with p, q and r distinct primes.at n=32A179696
• Sequence related to the Hankel transform of A105523(n+5).at n=30A181474
• Triangular array read by rows. T(n,k) is the number of ternary length-n words in which the longest run of consecutive 0's is exactly k; n>=0, 0<=k<=n.at n=56A209240
• a(n) = 2*n*(n+1)*(n+2)/3.at n=32A210440
• Number of partitions of n containing at least one part m-8 if m is the largest part.at n=36A212548
• Antidiagonal sums of the convolution array A213849.at n=30A213850
• Numbers n for which the alternating sum of the digits of n^n is 0.at n=32A244212
• Number of (n+2)X(4+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically.at n=4A253363