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A250073 Powers of 2 written in base 60, concatenating the decimal values of the sexagesimal digits. 6
1, 2, 4, 8, 16, 32, 104, 208, 416, 832, 1704, 3408, 10816, 21632, 43304, 90608, 181216, 362432, 1124904, 2253808, 4511616, 9423232, 19250504, 38501008, 117402016, 235204032, 510412104, 1021224208, 2042452416, 4125304832, 12251013704, 24542031408, 53124062816 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Each sexagesimal digit appears as a pair of decimal digits as on a digital clock. Any leading zeros are truncated. Thus decimal 64 appears as "104" and not "0104".

LINKS

Table of n, a(n) for n=0..32.

EXAMPLE

a(7) = 208, since 2^7 = 128 = 2 sixties plus 8, thus 2:08 in clock-like notation, which becomes 208 when restricted to the numeric characters.

MATHEMATICA

a250073[n_Integer] :=

FromDigits@

  StringJoin[

   If[# < 10, StringJoin["0", ToString[#]], ToString[#]] & /@

IntegerDigits[2^n, 60]]; a250073 /@ Range[60] (* Michael De Vlieger, Nov 11 2014 *)

PROG

(PARI) a(n) = {d = digits(2^n, 60); s = ""; for (i=1, #d, if (d[i] < 10, s = concat(s, "0")); s = concat(s, Str(d[i]))); eval(s); } \\ Michel Marcus, Nov 12 2014

CROSSREFS

Cf. A000079.

Sequence in context: A195458 A264656 A078227 * A260873 A138814 A233424

Adjacent sequences:  A250070 A250071 A250072 * A250074 A250075 A250076

KEYWORD

nonn,base

AUTHOR

Michael De Vlieger, Nov 11 2014

STATUS

approved

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Last modified June 16 06:46 EDT 2019. Contains 324145 sequences. (Running on oeis4.)