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A254335 Powers of 5 in base 60, concatenating the decimal values of the sexagesimal digits. 5
1, 5, 25, 205, 1025, 5205, 42025, 214205, 1483025, 9023205, 45124025, 346032205, 1850165025, 13411241205, 75057010025, 391445050205, 3161345251025, 16210847055205, 121454355292025, 648483937264205, 3404031807133025, 25020163036073205, 141141223300374025, 1105826524503082205, 5545214234515415025 (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 125 appears as "205" and not "0205".

LINKS

Michael De Vlieger, Table of n, a(n) for n = 0..1200

FORMULA

a(n) = A055643(A000351(n)). - Michel Marcus, Mar 02 2015

EXAMPLE

a(4) = 1025, since 5^4 = 625 = 10 * 60^1 + 25, thus 10:25 in clock-like notation, which becomes 1025 when restricted to numeric characters.

MATHEMATICA

f[n_] := FromDigits@ StringJoin[If[# < 10, StringJoin["0", ToString[#]],

ToString[#]] & /@ IntegerDigits[5^n, 60]]; Table[f@ i, {i, 0, 24}] (* Michael De Vlieger, Jan 28 2015 *)

PROG

(PARI) a(n) = subst(Pol(digits(5^n, 60)), x, 100); \\ Michel Marcus, Feb 22 2015

CROSSREFS

Cf. A000351 (Powers of 5), A055643 (Babylonian numbers).

Cf. Sexagesimal representations: A250073 (Powers of 2), A254334 (Powers of 3), A254336 (Powers of 10).

Sequence in context: A330198 A346269 A337041 * A193939 A229810 A080631

Adjacent sequences:  A254332 A254333 A254334 * A254336 A254337 A254338

KEYWORD

nonn,base

AUTHOR

Michael De Vlieger, Jan 28 2015

STATUS

approved

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