A130175 2n+1 appears (last digit of 2n+1) times .

1, 3, 3, 3, 5, 5, 5, 5, 5, 7, 7, 7, 7, 7, 7, 7, 9, 9, 9, 9, 9, 9, 9, 9, 9, 11, 13, 13, 13, 15, 15, 15, 15, 15, 17, 17, 17, 17, 17, 17, 17, 19, 19, 19, 19, 19, 19, 19, 19, 19, 21, 23, 23, 23, 25, 25, 25, 25, 25, 27, 27, 27, 27, 27, 27, 27, 29, 29, 29, 29, 29, 29, 29, 29, 29, 31, 33, 33

Offset

1,2

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Formula

a(n) = a(n-1) + a(n-25) - a(n-26) for n > 26. - Robert Israel, Jun 09 2023

Maple

seq((2*m+1)$(2*m+1 mod 10), m=0..100); # Robert Israel, Jun 09 2023

Mathematica

Table[Table[n, {Mod[n, 10]}], {n, 1, 35, 2}]//Flatten (* Harvey P. Dale, Apr 24 2018 *)

Crossrefs

Cf. A130146.

Sequence in context: A126661 A162226 A001650 * A200266 A101290 A080605

Adjacent sequences: A130172 A130173 A130174 * A130176 A130177 A130178

Keyword

nonn,base

Author

Paul Curtz, Aug 05 2007

Status

approved