The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A105993 Near-repunit semiprimes. 1
 115, 118, 119, 121, 141, 161, 411, 511, 611, 1011, 1101, 1114, 1115, 1119, 1121, 1141, 1191, 1211, 1411, 1711, 5111, 7111, 9111, 11101, 11114, 11141, 11181, 11611, 11911, 13111, 14111, 17111, 18111, 19111, 31111, 61111, 91111, 110111, 111011, 111101 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE a(2)=118 is a term because 118 is a semiprime and all digits are 1 except one. MATHEMATICA Select[Sort[Flatten[Table[FromDigits/@Permutations[PadRight[{k}, n, 1]], {n, 3, 6}, {k, Range[0, 9]}]]], PrimeOmega[#]==2&&Length[Union[ IntegerDigits[ #]]]>1&] (* Harvey P. Dale, Jun 13 2020 *) CROSSREFS Sequence in context: A101111 A129823 A056035 * A036269 A036462 A020443 Adjacent sequences: A105990 A105991 A105992 * A105994 A105995 A105996 KEYWORD base,nonn AUTHOR Shyam Sunder Gupta, Apr 29 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 25 04:52 EDT 2024. Contains 372782 sequences. (Running on oeis4.)