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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A159004 Numbers n which equal the sum of the prime factors of n^2+1217*n+370313. 0
309, 311, 381, 799, 851, 3515, 3535, 8659, 10199, 10331, 30461, 32853, 40135, 43255, 202099, 453931, 504415, 1365303, 2473735, 2545039, 20506915, 27172301, 31496621, 150107891, 4180621181, 23338398423, 608602531091 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..27.

FORMULA

{n: A001414(n^2+1217*n+370313)=n}.

EXAMPLE

For n=309, n^2+1217*n+370313= 841847=71*71*167, and 71+71+167=309.

For n=311, n^2+1217*n+370313=845521=61*83*167, and 61+83+167=311.

MAPLE

A001414 := proc(n) pfs := ifactors(n)[2] ; add(op(1, p)*op(2, p), p=pfs) ; end:

for n from 0 do p := n^2+1217*n+370313; if A001414(p) = n then printf("%d, \n", n) ; fi; od: # R. J. Mathar, Jul 26 2009

CROSSREFS

Sequence in context: A343273 A337955 A091552 * A031782 A060980 A061881

Adjacent sequences:  A159001 A159002 A159003 * A159005 A159006 A159007

KEYWORD

nonn,less

AUTHOR

Vincenzo Librandi, Jun 30 2009

EXTENSIONS

Edited by R. J. Mathar, Jul 26 2009

Corrected by Zak Seidov, Jul 29 2009

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 December 8 19:45 EST 2021. Contains 349596 sequences. (Running on oeis4.)