20516

Appears in sequences

• 12-gonal (or dodecagonal) pyramidal numbers: a(n) = n*(n+1)*(10*n-7)/6.at n=23A007587
• Numbers m such that 5^m reversed is a prime.at n=12A058993
• Smallest k > 0 with gcd(k, rev(k)) = n, where rev(k) is digit reversal of k, or 0 if no such k exists.at n=45A069554
• Numbers k such that (6^k)*(2^k - 1) - 1 is prime.at n=11A098863
• Numbers k such that k^3 contains a pandigital substring.at n=16A115933
• Smallest number k such that k^n is equal to the sum of n consecutive primes, or 1 if it does not exist.at n=43A123112
• Carlitz compositions of n into odd parts.at n=32A218694
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 358", based on the 5-celled von Neumann neighborhood.at n=43A271412