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Search: id:A135168
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| A135168 |
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a(n) = 7^n+5^n+3^n+2^n. Constants are the prime numbers in decreasing order. |
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+0
1
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| 4, 17, 87, 503, 3123, 20207, 134067, 903983, 6162243, 42326927, 292300947, 2026334063, 14085963363, 98111316047, 684331387827, 4778093469743, 33385561572483, 233393582711567, 1632228682858707, 11417969834487023, 79887637217085603, 559022711703937487
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OFFSET
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0,1
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EXAMPLE
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a(4)=3123 because 7^4=2401, 5^4=625, 3^4=81, 2^4=16 and we can write 2401+625+81+16=3123.
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CROSSREFS
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Cf. A000079, A000244, A000351, A000420, A001047, A074527, A007689, A135158, A135159, A135160.
Cf. A001551
Adjacent sequences: A135165 A135166 A135167 this_sequence A135169 A135170 A135171
Sequence in context: A056542 A110508 A114190 this_sequence A058279 A143405 A141154
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Nov 21 2007
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EXTENSIONS
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Edited by njas, Dec 14 2007
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