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⇱ A130224 - OEIS

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A130224
a(1) = 1; a(n) = a(n-1) + (number of times the digit 1 has appeared in the sequence so far).
2
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79, 84, 89, 94, 99, 104, 110, 118, 128, 139, 151, 165, 180, 196, 213, 231, 250, 269, 288, 307, 326, 345, 364, 383, 402, 421, 441, 462
OFFSET
1,2
LINKS
MAPLE
A130224 := proc(n)
option remember;
if n = 1 then
1;
else
a := procname(n-1) ;
for j from 1 to n-1 do
for d in convert(procname(j), base, 10) do
if d = 1 then
a := a+1 ;
end if;
end do:
end do:
a ;
end if;
end proc:
seq(A130224(n), n=1..52) ; # R. J. Mathar, Aug 06 2016
MATHEMATICA
ss={1}; s={1}; Do[a=ss[[-1]]+Count[s, 1]; s=Join[s, IntegerDigits[a]]; AppendTo[ss, a], {n, 2, 52}]; ss (* James C. McMahon, Feb 08 2025 *)
CROSSREFS
Sequence in context: A236686 A246084 A260768 * A017903 A005711 A322856
KEYWORD
base,easy,nonn
AUTHOR
Eric Angelini, Aug 05 2007
STATUS
approved