50851

Appears in sequences

• Strong pseudoprimes to base 10.at n=11A020236
• Strong pseudoprimes to base 100.at n=37A020326
• Numbers whose set of base 15 digits is {0,1}.at n=21A033051
• Numbers whose base-15 representation has exactly 5 runs.at n=0A043672
• Numbers n such that n^3 is palindromic in base 15.at n=15A046251
• n-th 4k+1 prime times (n+1)st 4k+3 prime.at n=23A048628
• a(n) = (n^2 - n + 1)*(n^2 + n + 1).at n=15A059826
• Area of consecutive Prime-Indexed Prime rectangles.at n=14A119658
• Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=18A203173
• Quasi-Carmichael numbers to exactly three bases.at n=19A257753
• Indices of the start of 10 successive distinct digits in the decimal expansion of e (2.718281828...).at n=27A258166
• Expansion of Product_{k>=1} 1/(1 - x^prime(k))^A056768(k).at n=43A321508
• Semiprimes m = p*q where m, p and q are in A033638 (locations of right angle turns in Ulam square spiral).at n=12A331997
• Composite numbers of the form k^2+k+1 all of whose prime factors are of that same form.at n=12A353056