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Search: id:A154311
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| A154311 |
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Numbers n such that sum of digits of n > sum of digits of prime(n). |
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+0
1
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| 5, 6, 9, 18, 26, 27, 28, 29, 36, 38, 47, 48, 49, 53, 54, 58, 64, 65, 66, 67, 68, 69, 79, 82, 83, 84, 86, 89, 96, 97, 98, 99, 126, 156, 169, 170, 172, 173, 174, 177, 178, 179, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 196, 197, 198, 199, 216, 252, 255, 257
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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If prime(n=5)=11 and 5>1+1=2, then 5=a(1). If prime(n=9)=23 and 9>2+3=5, then 9=a(2). If prime(n=18)=61 and 1+8=9>6+1=7, then 18=a(3). If prime(n=26)=101 and 2+6=8>1+0+1=2, then 26=a(4), etc.
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MAPLE
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sd := proc (n) options operator, arrow: add(convert(n, base, 10)[j], j = 1 .. nops(convert(n, base, 10))) end proc: a := proc (n) if sd(ithprime(n)) < sd(n) then n else end if end proc: seq(a(n), n = 1 .. 300); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 26 2009]
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CROSSREFS
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Cf. A000040.
Sequence in context: A047438 A117951 A124519 this_sequence A014980 A066901 A019125
Adjacent sequences: A154308 A154309 A154310 this_sequence A154312 A154313 A154314
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KEYWORD
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nonn,base
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 07 2009
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EXTENSIONS
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Missing terms added by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 26 2009
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