login
This site is supported by donations to The OEIS Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A120720 Even square as prime gaps to produce a set of triangular primes. 0
7, 19, 41, 11, 23, 43, 71, 47, 17, 29, 113, 157, 53, 23, 83, 163, 59, 167, 347, 173, 353, 47, 67, 131, 227, 431 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

23 seems to be made two different ways here.

LINKS

Table of n, a(n) for n=1..26.

FORMULA

a(n,m) = If[ PrimeQ[(2*n)^2 + Prime[m]], (2*n)^2 + Prime[m]]

EXAMPLE

7, 19

41

11, 23, 43, 71

47

17, 29, 113, 157

53

23, 83, 163

59, 167, 347

173, 353

47, 67, 131, 227, 431

MATHEMATICA

t[n_, m_] := If[ PrimeQ[(2*n)^2 + Prime[m]], (2*n)^2 + Prime[m], {}] a = Table[Flatten[Table[t[n, m], {n, 1, m}]], {m, 2, 11}] Flatten[a]

CROSSREFS

Sequence in context: A303855 A295077 A239359 * A098422 A191066 A087762

Adjacent sequences:  A120717 A120718 A120719 * A120721 A120722 A120723

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Aug 15 2006

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 19 20:30 EST 2019. Contains 319310 sequences. (Running on oeis4.)