21009

Appears in sequences

• a(n) = (10n+1)*(10n+9).at n=14A001535
• Numbers k such that k*(k+7) is a palindrome.at n=12A028564
• Numbers n such that A048767(n+1)=A048767(n).at n=22A048769
• T(n,n-3), array T as in A054120.at n=17A054121
• Smallest number not occurring earlier fitting the repeating pattern "99887766554433221100".at n=34A098782
• Positions of 3's in A234323.at n=57A234804
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 366", based on the 5-celled von Neumann neighborhood.at n=39A268275
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 297", based on the 5-celled von Neumann neighborhood.at n=32A271150
• Numbers n such that the decimal equivalent of the binary reflected Gray code representation of n is a palindromic prime.at n=39A281382