A084988 Numbers made with nonprime digits such that the sum of the digits is also not prime.

1, 4, 6, 8, 9, 10, 18, 19, 40, 44, 46, 48, 60, 64, 66, 68, 69, 80, 81, 84, 86, 88, 90, 91, 96, 99, 100, 108, 109, 114, 116, 118, 141, 144, 149, 161, 168, 169, 180, 181, 186, 189, 190, 194, 196, 198

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..5000

Example

E.g. 46 is not prime and 4+6 =10 is also not prime.

Mathematica

Select[Rest[FromDigits/@Tuples[{0, 1, 4, 6, 8, 9}, 3]], !PrimeQ[ Total[ IntegerDigits[ #]]]&] (* Harvey P. Dale, Jul 20 2017 *)

Crossrefs

Cf. A084984.

Sequence in context: A141613 A072362 A278948 * A202265 A004716 A212372

Adjacent sequences: A084985 A084986 A084987 * A084989 A084990 A084991

Keyword

nonn,base

Author

Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 27 2003

Status

approved