500001

Appears in sequences

• Hexamorphic numbers: k such that the k-th hexagonal number ends with k.at n=28A039594
• Numerators of continued fraction convergents to sqrt(89).at n=9A041158
• Numerators of continued fraction convergents to sqrt(356).at n=13A041674
• a(n) = n*10^n + 1.at n=5A064748
• Numbers m that divide the concatenation of m+1 and m+2.at n=20A069860
• Łukasiewicz words that are also valid asynchronic siteswap juggling patterns.at n=33A071160
• Numbers k with the property that k divides one of the concatenations (k-1)(k-2) or (k-2)(k-1).at n=24A077292
• Let p = n-th prime of the form 4k+1, take smallest solution (x,y) to the Pellian equation x^2 - p*y^2 = 1 with x and y >= 1; sequence gives value of x.at n=9A081232
• Let p = n-th prime, take smallest solution (x,y) to the Pellian equation x^2 - p*y^2 = 1 with x and y >= 1; sequence gives value of x.at n=23A081233
• Centered hexamorphic numbers: the k-th centered hexagonal number, 3k(k-1)+1, ends in k.at n=27A094534
• Numbers that require exactly five chisel strokes when written in Roman numerals.at n=47A133192
• a(n) = 15780962*n^2 - 25943924*n + 10662963.at n=0A157759
• Numbers n with property that average digit of n^2 is less than 1.at n=16A164842
• Smallest sequence which lists the position of digits "4" in the sequence.at n=31A167454
• Composite numbers of the form k*10^k + 1.at n=2A175188
• Numbers n with k digits such that n^2 == 1 (mod 10^k).at n=29A181607
• a(n) = 5*10^n + 1.at n=5A199685
• Semiprimes of the form n*10^n + 1.at n=1A216376
• Nonnegative solutions of the Pell equation x^2 - 89*y^2 = +1. Solutions x = a(n).at n=1A227110
• Positive fundamental solution x0 corresponding to the even y0 = 2*A261250 of the Pell equation x^2 - D y^2 = +1.at n=52A262024