61616

Appears in sequences

• Base-10 palindromes that start with 6.at n=38A043041
• Largest palindromic substring in 5^n.at n=51A046263
• Numbers whose consecutive digits differ by 5.at n=42A048407
• Smallest palindromic multiple of (n with trailing 0's omitted, A004151) using only nonzero digits of n; all digits must appear; or 0 if no such number exists.at n=15A083960
• Smallest palindromic multiple of n in which the digit string of n appears as sandwiched between at least a pair of digits, or 0 if n = 10k or no such number exists.at n=15A084043
• Biquadrateful (i.e., not biquadrate-free) palindromes.at n=36A133514
• Analog of A097717 in base 3.at n=7A249597
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 326", based on the 5-celled von Neumann neighborhood.at n=8A271260