The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A100368

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A100368

Numbers of the form 2^k * p where k > 0 and p is an odd prime.
(history; published version)

#41 by Michel Marcus at Mon Dec 21 02:20:27 EST 2020

STATUS

reviewed

approved

#40 by Joerg Arndt at Mon Dec 21 02:09:24 EST 2020

STATUS

proposed

reviewed

#39 by Amiram Eldar at Mon Dec 21 01:57:56 EST 2020

STATUS

editing

proposed

#38 by Amiram Eldar at Mon Dec 21 01:21:24 EST 2020

FORMULA

a(n) = 2*A038550(n). - Amiram Eldar, Dec 21 2020

CROSSREFS

Cf. A001221, A038550, A098902, A100367, A036348, A100484.

STATUS

approved

editing

#37 by N. J. A. Sloane at Sat Mar 09 00:40:38 EST 2019

STATUS

proposed

approved

#36 by Jon E. Schoenfield at Thu Jan 24 23:19:41 EST 2019

STATUS

editing

proposed

#35 by Jon E. Schoenfield at Thu Jan 24 23:19:39 EST 2019

COMMENTS

Composite numbers n k having the property that the number of divisors of 2n 2k equals the number of divisors of n k + 2. All primes satisfy this property. - Gary Detlefs, Jan 23 2019

STATUS

proposed

editing

#34 by Gary Detlefs at Wed Jan 23 10:12:46 EST 2019

STATUS

editing

proposed

#33 by Gary Detlefs at Wed Jan 23 10:12:22 EST 2019

COMMENTS

Composite numbers n having the property that the number of divisors of 2n equals the number of divisors of n + 2. All primes satisfy this property. - Gary Detlefs, Jan 23 2019

STATUS

proposed

editing

#32 by Gary Detlefs at Wed Jan 23 09:02:21 EST 2019

STATUS

editing

proposed

Discussion

Wed Jan 23

09:54

Michel Marcus: yes, so you entered a program, but there is no corresponding formula or comment to support it