A104211 Integers n such that the sum of the digits of n is not prime.

1, 4, 6, 8, 9, 10, 13, 15, 17, 18, 19, 22, 24, 26, 27, 28, 31, 33, 35, 36, 37, 39, 40, 42, 44, 45, 46, 48, 51, 53, 54, 55, 57, 59, 60, 62, 63, 64, 66, 68, 69, 71, 72, 73, 75, 77, 78, 79, 80, 81, 82, 84, 86, 87, 88, 90, 91, 93, 95, 96, 97, 99, 100, 103, 105, 107, 108, 109, 112

Offset

1,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Example

Sum of digits of 15=6 not prime.

Mathematica

Select[Range[250], !PrimeQ[Total[IntegerDigits[ # ]]]&] (* Vincenzo Librandi, Apr 17 2013 *)

Prog

(PARI) lista(n) = { my(x, y); for(x=1, n, y=sumdigits(x); if(!isprime(y), print1(x, ", ") ) ); }

Crossrefs

Sequence in context: A116661 A109104 A073303 * A132858 A071941 A188654

Adjacent sequences: A104208 A104209 A104210 * A104212 A104213 A104214

Keyword

easy,nonn,base

Author

Cino Hilliard, Mar 13 2005

Status

approved