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A135164
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7^n-5^n+3^n+2^n.
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0
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2, 7, 37, 253, 1873, 13957, 102817, 747733, 5380993, 38420677, 272769697, 1928677813, 13597682113, 95669909797, 672124356577, 4717058313493, 33080385791233, 231867703805317, 1624599288327457, 11379822861830773, 79696902353804353, 558069037387531237, 3907436894177226337
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Constants are the prime numbers in decreasing order.
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FORMULA
| a(n)=7^n-5^n+3^n+2^n.
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EXAMPLE
| a(4)=1873 because 7^4=2401, 5^4=625, 3^4=81, 2^4=16 and we can write 2401-625+81+16=1873.
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PROG
| (MAGMA)[7^n-5^n+3^n+2^n: n in [0..50]][From V. Librandi, Dec 14 2010]
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CROSSREFS
| Cf. A000079, A000244, A000351, A000420, A001047, A074527, A007689, A135158, A135159, A135160.
Sequence in context: A063766 A020040 A125191 * A072597 A125515 A135920
Adjacent sequences: A135161 A135162 A135163 * A135165 A135166 A135167
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Nov 21 2007
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EXTENSIONS
| More terms from Vincenzo Librandi, Dec 14 2010
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