A037049 Smallest number with two distinct prime factors both of length n.

6, 143, 10403, 1022117, 100160063, 10002200057, 1000036000099, 100000980001501, 10000004400000259, 1000000016000000063, 100000000520000000627, 10000000002200000000057, 1000000000100000000002379, 100000000000880000000001887, 10000000000009800000000002077

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Example

a(3)=10403 -> equals 101 * 103.

Mathematica

tdpf[n_]:=Module[{f1=NextPrime[Floor[Sqrt[10^n]]]}, {IntegerLength[f1], f1* NextPrime[f1]}]; Join[{6}, Table[SelectFirst[Array[tdpf, 50], #[[1]]==n&], {n, 2, 20}][[All, 2]]] (* Harvey P. Dale, Apr 06 2018 *)

Crossrefs

Sequence in context: A349069 A111839 A349076 * A196811 A200457 A128785

Adjacent sequences: A037046 A037047 A037048 * A037050 A037051 A037052

Keyword

nonn,base

Author

Patrick De Geest, Jan 04 1999

Extensions

Corrected and extended by Harvey P. Dale, Apr 06 2018

Status

approved