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A115661
Numbers n which have the same number of distinct prime divisors as the reverse of n.
2
1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 15, 16, 17, 21, 22, 23, 26, 28, 31, 32, 33, 36, 37, 39, 44, 45, 51, 54, 55, 56, 57, 58, 61, 62, 63, 65, 66, 68, 69, 71, 73, 75, 77, 79, 82, 85, 86, 88, 93, 96, 97, 99, 101, 107, 108, 111, 113, 115, 116, 117, 121, 122, 123, 125, 128
OFFSET
1,2
LINKS
EXAMPLE
omega(16)=omega(61)=1.
MATHEMATICA
Select[Range[130], PrimeNu[#]==PrimeNu[FromDigits[Reverse[ IntegerDigits[ #]]]]&] (* Harvey P. Dale, Jan 14 2012 *)
CROSSREFS
Sequence in context: A081306 A130073 A133812 * A318735 A002244 A037173
KEYWORD
base,nonn
AUTHOR
Giovanni Resta, Jan 29 2006
STATUS
approved