The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A290963 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A290963

Primes p such that sum of digits of p^3 is semiprime.
(history; published version)

#15 by Charles R Greathouse IV at Wed Aug 16 17:16:27 EDT 2017

STATUS

editing

approved

#14 by Charles R Greathouse IV at Wed Aug 16 17:15:54 EDT 2017

LINKS

Charles R Greathouse IV, <a href="/A290963/b290963.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

proposed

editing

Discussion

Wed Aug 16

17:16

Charles R Greathouse IV: Not really my taste either, but if Altug likes it I'll approve it.

#13 by Altug Alkan at Wed Aug 16 09:09:13 EDT 2017

STATUS

editing

proposed

#12 by Altug Alkan at Wed Aug 16 09:05:46 EDT 2017

CROSSREFS

Cf. A000040, A007605, A001358, A235398, A235399.

STATUS

proposed

editing

Discussion

Wed Aug 16

09:09

Altug Alkan: As a student, I respect you so much but indeed it is interesting for me. The main part of interesting thing in here is thinking about the trying to solve patterns and each time mind loses this war. (At this kind of sequence) Thanks, best regards.

#11 by Michel Marcus at Wed Aug 16 02:09:51 EDT 2017

STATUS

editing

proposed

Discussion

Wed Aug 16

04:25

Joerg Arndt: @Altug: I have to disagree, but tastes vary. For me "semiprimes" and "digits" in one definition make me go "eek".

#10 by Michel Marcus at Wed Aug 16 02:09:45 EDT 2017

CROSSREFS

Cf. A000040, A007605, A001358, A235398.

STATUS

proposed

editing

#9 by Altug Alkan at Wed Aug 16 00:57:54 EDT 2017

STATUS

editing

proposed

#8 by Altug Alkan at Wed Aug 16 00:31:29 EDT 2017

PROG

(PARI) lista(nn) = forprime(p=3, nn, if(bigomega(sumdigits(p^3)) == 2, print1(p, ", "))); \\ Altug Alkan, Aug 16 2017

Discussion

Wed Aug 16

00:57

Altug Alkan: There can be many conjectures about corresponding semiprimes. Interesting sequence for me. Thanks, best regards.

#7 by Altug Alkan at Wed Aug 16 00:30:56 EDT 2017

DATA

3, 7, 29, 41, 53, 59, 71, 83, 89, 113, 131, 137, 149, 157, 167, 173, 179, 197, 199, 227, 233, 239, 251, 263, 269, 281, 293, 317, 347, 379, 401, 409, 419, 431, 457, 463, 467, 479, 491, 503, 509, 521, 569, 617, 619, 641, 643, 647, 661, 677, 691, 701, 733, 743, 757, 761, 769, 797, 823, 829, 859, 883, 911

STATUS

proposed

editing

#6 by Robert Israel at Tue Aug 15 18:01:52 EDT 2017

STATUS

editing

proposed