The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A077719

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A077719

Primes which can be expressed as sum of distinct powers of 5.
(history; published version)

#10 by Alois P. Heinz at Mon May 31 09:34:37 EDT 2021

STATUS

reviewed

approved

#9 by Joerg Arndt at Mon May 31 09:11:29 EDT 2021

STATUS

proposed

reviewed

#8 by Michael S. Branicky at Mon May 31 09:07:40 EDT 2021

STATUS

editing

proposed

#7 by Michael S. Branicky at Mon May 31 09:06:13 EDT 2021

DATA

5, 31, 131, 151, 631, 751, 3251, 3881, 16381, 19381, 19501, 19531, 78781, 78901, 81281, 81401, 81901, 82031, 93901, 94531, 97001, 97501, 97651, 390751, 390781, 393901, 394501, 406381, 468781, 469501, 471901, 472631, 484531, 485131, 487651, 1953151, 1953901

LINKS

Michael S. Branicky, <a href="/A077719/b077719.txt">Table of n, a(n) for n = 1..10000</a>

PROG

(Python)

from sympy import isprime

def aupton(terms):

k, alst = 0, []

while len(alst) < terms:

k += 1

t = sum(5**i*int(di) for i, di in enumerate((bin(k)[2:])[::-1]))

if isprime(t): alst.append(t)

return alst

print(aupton(37)) # Michael S. Branicky, May 31 2021

EXTENSIONS

a(36) and beyond from Michael S. Branicky, May 31 2021

STATUS

approved

editing

#6 by N. J. A. Sloane at Thu Dec 05 19:55:55 EST 2013

AUTHOR

_Amarnath Murthy (amarnath_murthy(AT)yahoo.com), _, Nov 19 2002

Discussion

Thu Dec 05

19:55

OEIS Server: https://oeis.org/edit/global/2075

#5 by Russ Cox at Sat Mar 31 10:23:02 EDT 2012

EXTENSIONS

More terms from _Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), _, Jan 03 2003

Discussion

Sat Mar 31

10:23

OEIS Server: https://oeis.org/edit/global/354

#4 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008

OFFSET

0,1,1

KEYWORD

nonn,new

nonn

#3 by N. J. A. Sloane at Wed Sep 22 03:00:00 EDT 2004

KEYWORD

nonn,new

nonn

EXTENSIONS

More terms from Sascha Kurz (sascha.kurz(AT)stud.uni-bayreuth.de), Jan 03 2003

#2 by N. J. A. Sloane at Sat Sep 13 03:00:00 EDT 2003

KEYWORD

nonn,new

nonn

EXTENSIONS

More terms from Sascha Kurz (ssascha.kurz(AT)tustud.uni-bsbayreuth.de), Jan 03 2003

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

Primes which can be expressed as sum of distinct powers of 5.

DATA

OFFSET

0,1

COMMENTS

Primes whose base 5 representation contains only zeros and 1's.

CROSSREFS

Cf. A020449, A000695, A033042, A077717, A077718, A077720, A077721, A077722.

KEYWORD

nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 19 2002

EXTENSIONS

More terms from Sascha Kurz (s.kurz(AT)tu-bs.de), Jan 03 2003

STATUS

approved