20819

Appears in sequences

• Numbers k such that 10^k*(10^7*(-1+10^k)+6083806) + 10^k - 1 is prime.at n=11A107291
• G.f.: Product_{k>=1} (1+x^(k^2)) / (1-x^k).at n=31A280204
• Anagrasum integers: integers N that exactly reproduce their set of digits when we form the set of sums of pairs of adjacent digits.at n=46A296521
• Expansion of Product_{k>0} (1 + Sum_{m>0} x^(k*m!)).at n=47A304332
• Exponents k such that exp(k)/Pi is closer to an integer than for any smaller k.at n=10A387495