The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A156660

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A156660

Characteristic function of Sophie Germain primes.
(history; published version)

#36 by Michael De Vlieger at Sun Nov 06 07:47:59 EST 2022

STATUS

reviewed

#35 by Joerg Arndt at Sun Nov 06 05:31:48 EST 2022

STATUS

proposed

#34 by Michel Marcus at Sun Nov 06 04:40:32 EST 2022

STATUS

editing

Discussion

Sun Nov 06

04:51

Michel Marcus: no; I guess it is ok

#33 by Michel Marcus at Sun Nov 06 04:32:46 EST 2022

PROG

-- _Reinhard Zmkeller_, May 01 2012

Discussion

Sun Nov 06

04:39

Michel Marcus: to go with the name, I would have written : forprime(p=2, 100, print1(isprime(2*p+1), ", ")) and then I get A079295 : see 2nd formula of 1st formula line

04:40

Michel Marcus: the name should be chnaged ?

#32 by Michel Marcus at Sun Nov 06 04:31:41 EST 2022

LINKS

R. Zumkeller, <a href="/A156660/b156660.txt">Table of n, a(n) for n = 0..10000</a>

<a href="/index/Ch#char_fns">Index entries for characteristic functions</a>

STATUS

approved

#31 by Susanna Cuyler at Sat Feb 10 17:50:00 EST 2018

STATUS

proposed

#30 by Jon E. Schoenfield at Sat Feb 10 17:03:25 EST 2018

STATUS

editing

#29 by Jon E. Schoenfield at Sat Feb 10 17:03:22 EST 2018

FORMULA

A156874(n) = SUM(a(k): 1<=k<=n). [From _Reinhard Zumkeller_, Feb 18 2009]

STATUS

proposed

#28 by Andrew Howroyd at Sat Feb 10 14:58:07 EST 2018

STATUS

editing

#27 by Andrew Howroyd at Sat Feb 10 14:24:09 EST 2018

LINKS

R. Zumkeller, <a href="/A156660/b156660.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

approved