login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A210646 Primes which are the sum of two numbers of the form k*(k+1)^2/2. 2
2, 11, 59, 149, 197, 233, 607, 829, 929, 1283, 1619, 1879, 2459, 2917, 3251, 3299, 3359, 3947, 4523, 5821, 5843, 5869, 6043, 6143, 6269, 6833, 7229, 8573, 8597, 9479, 9619, 11699, 11783, 11789, 12379, 14639, 15881, 16477, 18869, 19121, 20849, 21149, 21617 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

EXAMPLE

149 is in the sequence because 149 is prime and 149 = 2*(2+1)^2/2 + 6*(6+1)^2/2.

MATHEMATICA

f[n_] := n (n + 1)^2/2; t = Table[f[n], {n, 0, 40}]; Select[Union[Flatten[Outer[Plus, t, t]]], # < t[[-1]] && PrimeQ[#] &] (* T. D. Noe, Apr 03 2012 *)

CROSSREFS

Cf. A006002, A129634, A210647.

Sequence in context: A241103 A162771 A020057 * A054564 A280674 A139172

Adjacent sequences:  A210643 A210644 A210645 * A210647 A210648 A210649

KEYWORD

nonn

AUTHOR

Gerasimov Sergey, Mar 26 2012

EXTENSIONS

Terms checked by R. J. Mathar, Mar 28 2012

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 June 13 18:45 EDT 2021. Contains 345008 sequences. (Running on oeis4.)