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Search: id:A104213
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| A104213 |
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Nonprime sums of the digits of primes. |
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+0
1
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| 13, 17, 19, 31, 37, 53, 59, 71, 73, 79, 97, 103, 107, 109, 127, 149, 163, 167, 181, 211, 233, 239, 251, 257, 271, 277, 293, 307, 347, 349, 367, 383, 389, 419, 431, 433, 439, 457, 479, 491, 499, 503, 509, 521, 523, 541, 547, 563, 569, 587, 613, 617, 619, 631
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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Sum of digits of prime 13=4 not prime so 13 is listed
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MATHEMATICA
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Select[ Prime[ Range[115]], !PrimeQ[Plus @@ IntegerDigits[ # ]] &] (from Robert G. Wilson v Mar 16 2005)
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PROGRAM
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(PARI) sdprime(n) = { local(x, y); forprime(x=1, n, y=sumdigits(x); if(isprime(y), print1(y", ") ) ) } sumdigits(n) = \ The sum of the digits of n { local(x, j, s=0); x=digits(n); for(j=1, length(x), s+=x[j]; ); return(s) } digits(n) = \ The vector of the digits of n { return(eval(Vec(Str(n)))) }
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CROSSREFS
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Sequence in context: A099184 A098095 A059500 this_sequence A105896 A112741 A111380
Adjacent sequences: A104210 A104211 A104212 this_sequence A104214 A104215 A104216
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KEYWORD
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easy,nonn,base
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Mar 13 2005
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