A023383 -id:A023383 - cp's OEIS frontend

A023390 a(n+1) = a(n) written in base 7 (read in base 10); a(1) = 7.

7, 10, 13, 16, 22, 31, 43, 61, 115, 223, 436, 1162, 3250, 12322, 50632, 300421, 2360602, 26031136, 434155345, 13521155011, 656031631000, 65253034566544, 16513243012141246, 13066154302600036600, 32251566130104220405204

Offset: 1

David W. Wilson

Floor(a(n+1)/a(n)) = 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 4, 5, 7, 11, 16, 31, 48, 99, 253, 791, 2468, 10239, 61885, 512044, 4334146, 75263018, ... - Zak Seidov, Apr 18 2014

All first differences are multiples of 3. - Zak Seidov, Oct 21 2014

			a(1) = 7 = 10[7], i.e., "10" in base 7, thus a(2)=10.
a(2) = 10 = 13[7], thus a(3)=13.

Vincenzo Librandi, Table of n, a(n) for n = 1..47

Cf. A023383.

NestList[FromDigits[IntegerDigits[#, 7]] &, 7, 30] (* Zak Seidov, Apr 18 2014 *)

step(n)=fromdigits(digits(n,7),10)
n=7;concat(n,vector(99,i,n=step(n))) \\ Charles R Greathouse IV, Oct 21 2014

Edited by M. F. Hasler, Oct 23 2014

A023392 a(n+1) = a(n) converted to base 10 from base 9 (written in base 10).

Original entry on oeis.org

9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 26, 28, 31, 34, 37, 41, 45, 50, 55, 61, 67, 74, 82, 101, 122, 145, 171, 210, 253, 311, 375, 456, 556, 677, 832, 1124, 1478, 2022, 2686, 3614, 4855, 6584, 10025, 14668, 22107, 33283, 50581, 76341, 125643, 211313

Offset: 1

David W. Wilson

Vincenzo Librandi, Table of n, a(n) for n = 1..160

Cf. A023383, A023390.

NestList[FromDigits[IntegerDigits[#,9]]&,9,53] (* Zak Seidov, Apr 18 2014 *)

cp's OEIS Frontend

A023390 a(n+1) = a(n) written in base 7 (read in base 10); a(1) = 7.

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