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Search: id:A159004
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| A159004 |
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Numbers n which equal the sum of the prime factors of n^2+1217*n+370313. |
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+0
1
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| 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; listen)
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OFFSET
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1,1
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FORMULA
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{n: A001414(n^2+1217*n+370313)=n}.
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EXAMPLE
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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 6+83+167=311.
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MAPLE
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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
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CROSSREFS
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Sequence in context: A118843 A053172 A091552 this_sequence A031782 A060980 A061881
Adjacent sequences: A159001 A159002 A159003 this_sequence A159005 A159006 A159007
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KEYWORD
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nonn,less
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jun 30 2009
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 26 2009
Corrected by Zak Seidov, Jul 29 2009
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