23412

Appears in sequences

• Numbers k such that (k / sum of digits of k) and (k+1 / sum of digits of k+1) are both prime.at n=23A085775
• Integers are written in the form abcd...n where "a" means "At position a in this integer there is a digit b"; "b" means: "at position b there is a digit c"; "c" means: "at position c there is a digit d"; ... and "n" means nothing. No repetitions are allowed (like in the integer 111).at n=36A105958
• Members of 3-cycles of permutation A111273.at n=21A113701
• a(n) is the smallest number not already in the sequence, such that the concatenation of all a(n) displays the periodic digit string 1, 2, 3, 4 (and repeat).at n=15A165302
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and -2<=w+x+y<=2.at n=40A211616
• Unmatched value maps: number of nX3 binary arrays indicating the locations of corresponding elements not equal to any king-move neighbor in a random 0..3 nX3 array.at n=4A219566
• Unmatched value maps: number of nX5 binary arrays indicating the locations of corresponding elements not equal to any king-move neighbor in a random 0..3 nX5 array.at n=2A219568
• T(n,k)=Unmatched value maps: number of nXk binary arrays indicating the locations of corresponding elements not equal to any king-move neighbor in a random 0..3 nXk array.at n=23A219569
• T(n,k)=Unmatched value maps: number of nXk binary arrays indicating the locations of corresponding elements not equal to any king-move neighbor in a random 0..3 nXk array.at n=25A219569
• Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010001.at n=9A260200
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 913", based on the 5-celled von Neumann neighborhood.at n=25A273768
• Number of integer partitions of n whose number of submultisets is greater than n.at n=38A325831
• Numbers that are the sum of eight fourth powers in exactly nine ways.at n=27A345841
• a(n) is the smallest number which can be represented as the sum of n distinct nonzero fourth powers in exactly 2 ways, or -1 if no such number exists.at n=7A374579