A144162 Numbers with at least two digits in which all digits except the rightmost are 0 or 5 and the rightmost is neither 0 nor 5.

51, 52, 53, 54, 56, 57, 58, 59, 501, 502, 503, 504, 506, 507, 508, 509, 551, 552, 553, 554, 556, 557, 558, 559, 5001, 5002, 5003, 5004, 5006, 5007, 5008, 5009, 5051, 5052, 5053, 5054, 5056, 5057, 5058, 5059, 5501, 5502, 5503, 5504, 5506, 5507, 5508, 5509, 5551

Offset: 1

Author

David Applegate, Marc LeBrun and N. J. A. Sloane, Aug 24 2010

Keywords

• nonn
• base

Comments

These are called f-type numbers, cf. A163396.

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000
• Index entries for sequences related to carryless arithmetic

Crossrefs

Cf. A143712, A163396, A169984.

Programs

Mathematica

Flatten[Table[10#+r,{r,{1,2,3,4,6,7,8,9}}]&/@FromDigits/@(Join[{5},#]&/@ Flatten[ Table[Tuples[{0,5},f],{f,0,3}],1])] (* Harvey P. Dale, Oct 18 2020 *)