The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A243941 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A243941

Number of decompositions of 36*n^2 into the sum of two twin prime pairs.
(history; published version)

#30 by OEIS Server at Wed Sep 18 05:28:43 EDT 2019

LINKS

David A. Corneth, <a href="/A243941/b243941_1.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Andrew Howroyd)

#29 by Bruno Berselli at Wed Sep 18 05:28:43 EDT 2019

STATUS

reviewed

approved

Discussion

Wed Sep 18

05:28

OEIS Server: Installed new b-file as b243941.txt.  Old b-file is now b243941_1.txt.

#28 by Michel Marcus at Wed Sep 18 04:42:09 EDT 2019

STATUS

proposed

reviewed

#27 by David A. Corneth at Tue Sep 17 17:41:40 EDT 2019

STATUS

editing

proposed

#26 by David A. Corneth at Tue Sep 17 17:41:36 EDT 2019

LINKS

Andrew Howroyd, David A. Corneth, <a href="/A243941/b243941_1.txt">Table of n, a(n) for n = 1..10000</a> (first 1000</a> terms from Andrew Howroyd)

STATUS

approved

editing

#25 by Sean A. Irvine at Tue Sep 17 14:56:38 EDT 2019

STATUS

proposed

approved

#24 by Michel Marcus at Tue Sep 17 13:28:43 EDT 2019

STATUS

editing

proposed

#23 by Michel Marcus at Tue Sep 17 13:28:40 EDT 2019

CROSSREFS

Cf. A243940 (decompositions of n^2 into 4 primes).

STATUS

proposed

editing

#22 by Andrew Howroyd at Tue Sep 17 13:03:43 EDT 2019

STATUS

editing

proposed

#21 by Andrew Howroyd at Tue Sep 17 12:16:59 EDT 2019

DATA

1, 2, 2, 5, 5, 3, 6, 3, 6, 8, 5, 6, 7, 6, 10, 10, 9, 8, 15, 10, 13, 8, 23, 5, 16, 21, 10, 20, 13, 30, 12, 14, 26, 16, 35, 16, 21, 22, 23, 38, 17, 28, 20, 36, 37, 16, 30, 27, 35, 33, 35, 29, 25, 34, 43, 51, 32, 44, 28, 39, 51, 40, 49, 31, 76, 31, 30, 52, 36, 103

LINKS

Andrew Howroyd, <a href="/A243941/b243941.txt">Table of n, a(n) for n = 1..1000</a>

PROG

(PARI) a(n)={my(m=18*n^2, s=0); forprime(p=5, m/2, if(isprime(m-p) && isprime(p-2) && isprime(m-p+2), s++)); s} \\ Andrew Howroyd, Sep 17 2019

KEYWORD

nonn,more

nonn

EXTENSIONS

Terms a(41) and beyond from Andrew Howroyd, Sep 17 2019

STATUS

approved

editing