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A228119
Numbers n such that n * (product of digits of n) + 1 is prime.
1
1, 2, 4, 6, 16, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 34, 42, 52, 61, 65, 66, 69, 72, 83, 84, 86, 92, 98, 114, 123, 134, 138, 161, 165, 169, 176, 186, 192, 213, 216, 219, 222, 223, 228, 239, 249, 253, 256, 258, 259, 265, 273, 286, 289, 292, 293, 294, 297
OFFSET
1,2
LINKS
EXAMPLE
16 is a member since 16 * (product of digits of 16) + 1 = 16*6 + 1 = 97 is a prime.
MATHEMATICA
Select[Range[300], PrimeQ[(#*Times @@ IntegerDigits[#]) + 1] &]
CROSSREFS
Sequence in context: A001774 A053285 A286850 * A078148 A076075 A030157
KEYWORD
nonn,base
AUTHOR
Jayanta Basu, Aug 14 2013
STATUS
approved