A039405 - OEIS

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A039405

Numbers whose base-10 representation has the same nonzero number of 1's and 5's.

15, 51, 105, 125, 135, 145, 150, 152, 153, 154, 156, 157, 158, 159, 165, 175, 185, 195, 215, 251, 315, 351, 415, 451, 501, 510, 512, 513, 514, 516, 517, 518, 519, 521, 531, 541, 561, 571, 581, 591, 615, 651, 715, 751, 815, 851, 915, 951, 1005, 1025

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..50.

MATHEMATICA

Select[Range[1100], DigitCount[#, 10, 1]==DigitCount[#, 10, 5]>0&] (* Harvey P. Dale, Nov 26 2020 *)

CROSSREFS

Sequence in context: A002602 A098831 A265039 * A043228 A044008 A201054

Adjacent sequences: A039402 A039403 A039404 * A039406 A039407 A039408

KEYWORD

nonn,base,easy

AUTHOR

Olivier Gérard

STATUS

approved