The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A166744 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A166744

Unlucky primes: numbers which are members of both A000040 (primes) and A050505 (unlucky).
(history; published version)

#21 by Amiram Eldar at Fri Sep 04 10:34:47 EDT 2020

STATUS

reviewed

approved

#20 by Michel Marcus at Fri Sep 04 01:19:45 EDT 2020

STATUS

proposed

reviewed

#19 by Davide Rotondo at Wed Sep 02 03:10:46 EDT 2020

STATUS

editing

proposed

#18 by Davide Rotondo at Wed Sep 02 03:10:44 EDT 2020

COMMENTS

There are infinite infinitely many unlucky prime numbers, in particular all those of the form 6n - 1, eliminated in the second step of Ulam's procedure for lucky numbers. - Davide Rotondo, Aug 31 2020

STATUS

proposed

editing

#17 by Amiram Eldar at Mon Aug 31 14:40:51 EDT 2020

STATUS

editing

proposed

Discussion

Wed Sep 02

02:26

Joerg Arndt: "infinite" --> "infinitely many"?

#16 by Amiram Eldar at Mon Aug 31 14:40:41 EDT 2020

CROSSREFS

Cf. A007528, A031157 (lucky primes).

STATUS

proposed

editing

#15 by Amiram Eldar at Mon Aug 31 14:38:19 EDT 2020

STATUS

editing

proposed

#14 by Amiram Eldar at Mon Aug 31 14:38:10 EDT 2020

COMMENTS

There are infinite unlucky prime numbers, in particular all those of the form 6n - 1, eliminated in the second step of Ulam's procedure for lucky numbers. - _Davide Rotondo, _, Aug 31 2020

STATUS

proposed

editing

#13 by Davide Rotondo at Mon Aug 31 14:34:36 EDT 2020

STATUS

editing

proposed

#12 by Davide Rotondo at Mon Aug 31 14:34:09 EDT 2020

COMMENTS

P { margin-bottom: 0.21cm; }A:link { There are infinite unlucky prime numbers, in particular all those of the form 6n - 1, eliminated in the second step of Ulam's procedure for lucky numbers. - Davide Rotondo, Aug 31 2020