50001

Appears in sequences

• Trimorphic numbers: n^3 ends with n. Also m-morphic numbers for all m > 5 such that m-1 is not divisible by 10 and m == 3 (mod 4).at n=41A033819
• Hexamorphic numbers: k such that the k-th hexagonal number ends with k.at n=22A039594
• Trimorphic but not bimorphic nor automorphic.at n=32A056032
• Numbers where k-th digit from right is either 0 or k.at n=17A063013
• Numbers m that divide the concatenation of m+1 and m+2.at n=17A069860
• Numbers k with the property that k divides one of the concatenations (k-1)(k-2) or (k-2)(k-1).at n=20A077292
• Smallest n-digit squarefree number beginning with n.at n=4A077513
• Centered hexamorphic numbers: the k-th centered hexagonal number, 3k(k-1)+1, ends in k.at n=20A094534
• Number of times 1 is used in writing out all numbers 1 through 10^n.at n=5A094797
• Triangle T, read by rows, such that column k equals column 0 of T^(k+1), where column 0 of T allows the n-th row sums to be zero for n>0 and where T^k is the k-th power of T as a lower triangular matrix.at n=59A101897
• Numbers k such that k and k^2 use only the digits 0, 1, 2 and 5.at n=51A136822
• a(n) = 80*n^2 + 1.at n=25A158776
• a(n) = smallest positive number having no digits in common with n and greater than any earlier term.at n=43A160015
• Numbers n with property that average digit of n^2 is less than 1.at n=3A164842
• Numbers n with k digits such that n^2 == 1 (mod 10^k).at n=22A181607
• a(n) = 5*10^n + 1.at n=4A199685
• Partial sums of A009927.at n=21A265038
• Number of partitions of n^5 into at most two parts.at n=10A274325
• Numbers n such that the product of proper divisors of n ends with n and n is not a multiplicatively perfect number (A007422).at n=20A278474
• Numbers k such that the decimal representation of k ends that of the sum of the first k cubes.at n=17A301912