The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A254334 Powers of 3 in base 60, concatenating the decimal values of the sexagesimal digits. 5
 1, 3, 9, 27, 121, 403, 1209, 3627, 14921, 52803, 162409, 491227, 2273721, 7225203, 22083609, 106254827, 319172521, 957521603, 2953364809, 12940502427, 42902311321, 132707334003, 402122410009, 2010408030027, 6031224090121, 18093712270403, 54285137211209 (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 81 appears as "121" and not "0121". LINKS Michael De Vlieger, Table of n, a(n) for n = 0..1200 FORMULA a(n) = A055643(A000244(n)). - Michel Marcus, Mar 02 2015 EXAMPLE a(6) = 1209, since 3^6 = 729 = 12 * 60^1 + 9, thus 12:09 in clock-like notation, which becomes 1209 when restricted to numeric characters. MATHEMATICA f[n_] := FromDigits@ StringJoin[If[# < 10, StringJoin["0", ToString[#]], ToString[#]] & /@ IntegerDigits[3^n, 60]]; Table[f@ i, {i, 0, 26}] (* Michael De Vlieger, Jan 28 2015 *) PROG (PARI) a(n) = subst(Pol(digits(3^n, 60)), x, 100); \\ Michel Marcus, Feb 22 2015 (Python) def digits(n, b=10): # list of digits of n in base b ....x, y = n, [] ....while x >= b: ........x, r = divmod(x, b) ........y.append(r) ....y.append(x) ....return list(reversed(y)) A254334_list = [int(''.join([format(x, '02d') for x in digits(3**i, 60)])) for i in range(10**2)] # Chai Wah Wu, Mar 14 2015 CROSSREFS Cf. A000244 (Powers of 3), A055643 (Babylonian numbers). Cf. Sexagesimal representations: A250073 (Powers of 2), A254335 (Powers of 5), A254336 (Powers of 10). Sequence in context: A323927 A146151 A306681 * A028855 A299597 A143014 Adjacent sequences:  A254331 A254332 A254333 * A254335 A254336 A254337 KEYWORD nonn,base AUTHOR Michael De Vlieger, Jan 28 2015 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 26 11:35 EDT 2021. Contains 346294 sequences. (Running on oeis4.)