OFFSET
1,1
COMMENTS
The lower and upper asymptotic densities of this sequence are 1/54 and 10/63, respectively. - Amiram Eldar, Feb 27 2021
LINKS
Jeremy Gardiner, Table of n, a(n) for n = 1..1111
FORMULA
a(n) = n + (53*10^floor(log_10(9*n-8))-8)/9. - Alan Michael Gómez Calderón, May 17 2023
MAPLE
seq(seq(6*10^n+k, k=0..10^n-1), n=0..3); # Robert Israel, May 08 2017
MATHEMATICA
Select[Range[1000], IntegerDigits[#][[1]] == 6 &] (* T. D. Noe, Oct 02 2012 *)
PROG
(PARI) isok(n) = digits(n)[1] == 6; \\ Michel Marcus, May 08 2017
(GAP) Flat(List([0..2], n->List([0..10^n-1], k->6*10^n+k))); # Muniru A Asiru, Nov 21 2018
(Magma) [n: n in [1..1600] | Intseq(n)[#Intseq(n)] eq 6]; // Vincenzo Librandi, Nov 24 2018
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Jeremy Gardiner, Oct 02 2012
STATUS
approved