cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A304025 a(n) is the largest integer that can be written with n digits in base 3/2.

Original entry on oeis.org

2, 5, 8, 14, 23, 35, 53, 80, 122, 185, 278, 419, 629, 944, 1418, 2129, 3194, 4793, 7190, 10787, 16181, 24272, 36410, 54617, 81926, 122891, 184337, 276506, 414761, 622142, 933215, 1399823, 2099735, 3149603, 4724405, 7086608, 10629914
Offset: 1

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Author

Tanya Khovanova and PRIMES STEP Senior group, May 04 2018

Keywords

Comments

A070885 is the smallest integer that can be written with n digits in base 3/2.
This sequence represented in base 3/2 is A304024.

Examples

			The number 5 in base 3/2 is 22, and the number 6 is 210. Therefore, 5 is the largest integer needing two digits in base 3/2.
		

Crossrefs

Programs

  • PARI
    first(n) = {my(res = vector(n)); res[1] = 2; for(i = 2, n, res[i] = 3 * res[i-1] / 2 + if(res[i-1] % 2==0, 2, 1/2));res} \\ David A. Corneth, May 11 2018

Formula

a(n) = A070885(n+1) - 1.