23415

Appears in sequences

• Positive numbers k such that k and 2*k are anagrams in base 6 (written in base 6).at n=28A023064
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 51.at n=2A031729
• Array read by rows in which the n-th row contains the multiples of n in increasing order using all the digits of first n numbers.at n=23A078189
• a(n) = T(n^3) - T(n), where T() are the triangular numbers (A000217).at n=6A085742
• Expansion of (1+t^2+4*t^3+2*t^4+t^5+3*t^6)/((1-t)^2*(1-t^2)*(1-t^3)^2).at n=29A100779
• Numbers with 5 distinct digits {1,2,3,4,5} such that all adjacent digits (as well as first and last digits) are coprime.at n=17A104972
• a(n) equals the (n*(n+1)/2)-th partial sum of the self-convolution cube of A010054, which has the g.f.: Sum_{k>=0} x^(k*(k+1)/2).at n=35A109414
• a(n) = n*a(n-2) + a(n-5) for n >= 5 and with a(0)=0, a(1)=1, a(2)=0, a(3)=3, a(4)=0.at n=14A130637
• Permutations of 12345: Numbers having each of the decimal digits 1,...,5 exactly once, and no other digit.at n=32A178475
• Number of nondecreasing arrangements of n+3 numbers in 0..4 with each number being the sum mod 5 of three others.at n=21A183899
• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=16A192973
• The number of parents of successive approximations used in a greedy approach to creating a Garden of Eden in Conway's Game of Life.at n=9A196447
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 590", based on the 5-celled von Neumann neighborhood.at n=42A273117
• List of André permutations of the first kind.at n=17A278982
• Numbers which are palindromic in their Elias delta code representation.at n=43A281380
• Number of equivalence classes of pairs of permutations in S_n where two pairs are equivalent if they are simultaneously conjugate to each other or simultaneously conjugate to each other after a reversal of one pair.at n=8A327015
• Expansion of e.g.f. 1/(1 - x * exp(x^2/2)).at n=7A358264