The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A267697 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A267697

Numbers with 7 odd divisors.
(history; published version)

#30 by Giovanni Resta at Sun Aug 19 06:28:25 EDT 2018

STATUS

reviewed

approved

#29 by Joerg Arndt at Sun Aug 19 06:27:21 EDT 2018

STATUS

proposed

reviewed

#28 by David A. Corneth at Tue Aug 14 04:42:20 EDT 2018

STATUS

editing

proposed

Discussion

Tue Aug 14

10:38

Julie Jones: Thank you

#27 by David A. Corneth at Tue Aug 14 04:41:52 EDT 2018

LINKS

David A. Corneth, <a href="/A267697/b267697.txt">Table of n, a(n) for n = 1..10000</a>

#26 by David A. Corneth at Tue Aug 14 04:34:09 EDT 2018

PROG

(PARI) upto(n) = {my(res = List()); forprime(p = 3, sqrtnint(n, 6), listput(res, p^6)); q = #res; for(i = 1, #q, odd = res[i]; for(j = 1, logint(n \ odd, 2), listput(res, odd <<= 1))); listsort(res); res} \\ David A. Corneth, Aug 14 2018

#25 by David A. Corneth at Tue Aug 14 04:26:26 EDT 2018

PROG

#24 by David A. Corneth at Tue Aug 14 04:08:30 EDT 2018

COMMENTS

Numbers that can be formed in exactly 6 ways by summing sequences of 2 or more consecutive positive integers. - Julie Jones, Aug 13 2018

STATUS

proposed

editing

Discussion

Tue Aug 14

04:08

David A. Corneth: without positive the statement is incorrect.

#23 by David A. Corneth at Tue Aug 14 03:56:33 EDT 2018

STATUS

editing

proposed

#22 by David A. Corneth at Tue Aug 14 03:53:29 EDT 2018

PROG

KEYWORD

nonn,easy,changed

#21 by David A. Corneth at Tue Aug 14 03:48:10 EDT 2018

COMMENTS

Numbers of the form p^6 * 2^k where p is an odd prime. - David A. Corneth, Aug 14 2018

STATUS

proposed

editing