|
| |
|
|
A157676
|
|
Numbers n such that n + (product of digits) is prime.
|
|
0
| |
|
|
1, 21, 23, 27, 29, 61, 67, 81, 83, 101, 103, 107, 109, 161, 163, 169, 233, 239, 253, 259, 283, 289, 293, 299, 307, 329, 341, 343, 347, 349, 361, 401, 409, 431, 437, 439, 441, 443, 449, 471, 473, 477, 493, 499, 503, 509, 529, 563, 569, 601, 607, 611, 613, 617
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
FORMULA
| a(n) = n + DigitProduct(n)
|
|
|
EXAMPLE
| a(21) = 21 + (2)(1) = 23 (prime). a(67) = 67 + (6)(7) = 109 (prime). a(169) = 169 + (1)(6)(9) = 223 (prime).
|
|
|
MATHEMATICA
| fQ[n_] := PrimeQ[n + Times @@ IntegerDigits@n]; Select[ Range@1000, fQ@# &] [From Robert G. Wilson v (rgwv(AT)rgwv.com), May 04 2009]
|
|
|
CROSSREFS
| Sequence in context: A095441 A095437 A089787 * A066867 A111356 A033267
Adjacent sequences: A157673 A157674 A157675 * A157677 A157678 A157679
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| Kyle D. Balliet (kdballie(AT)bloomu.edu), Mar 04 2009
|
|
|
EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), May 04 2009
|
| |
|
|
