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!)
 A061583 a(1) = 1, a(n) is the number obtained by replacing each digit of a(n-1) with five times its value. 4
 1, 5, 25, 1025, 501025, 250501025, 10250250501025, 501025010250250501025, 2505010250501025010250250501025, 1025025050102502505010250501025010250250501025 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Number of digits of each term is the sequence A038718. - Dmitry Kamenetsky, Jan 17 2009 LINKS John Cerkan, Table of n, a(n) for n = 1..17 MAPLE a:= proc(n) option remember; `if`(n=1, 1, (s-> parse(cat(       seq(parse(s[i])*5, i=1..length(s)))))(""||(a(n-1))))     end: seq(a(n), n=1..10);  # Alois P. Heinz, May 25 2018 MATHEMATICA NestList[FromDigits[Flatten[IntegerDigits/@(5*IntegerDigits[#])]]&, 1, 10] (* Harvey P. Dale, Dec 31 2013 *) PROG (Python) def A061583_first(n):     an = "1"     a061583 = []     while n > 1:         a061583.append(int(an))         newan = ""         for i in an:             newan += str(5*int(i))         an = newan         n -= 1     a061583.append(int(an))     return a061583 # John Cerkan, May 25 2018 CROSSREFS Cf. A061581, A061582, A061584, A061585, A061586, A061587. Sequence in context: A169652 A137114 A067212 * A278120 A039780 A328124 Adjacent sequences:  A061580 A061581 A061582 * A061584 A061585 A061586 KEYWORD nonn,base,easy AUTHOR Amarnath Murthy, May 13 2001 EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org) and Asher Natan Auel (auela(AT)reed.edu), May 15 2001 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 June 14 15:36 EDT 2021. Contains 345025 sequences. (Running on oeis4.)