A115662 Nonpalindromic n which have the same number of distinct prime divisors as the reverse of n.

12, 13, 15, 16, 17, 21, 23, 26, 28, 31, 32, 36, 37, 39, 45, 51, 54, 56, 57, 58, 61, 62, 63, 65, 68, 69, 71, 73, 75, 79, 82, 85, 86, 93, 96, 97, 107, 108, 113, 115, 116, 117, 122, 123, 125, 128, 129, 132, 135, 143, 144, 149, 153, 155, 156, 157, 158, 159, 162, 163

Offset: 1

Author

Giovanni Resta, Jan 29 2006

Keywords

• base
• nonn

Examples

			omega(16)=omega(61)=1.
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A001221, A115661.

Programs

Mathematica

npnQ[n_]:=!PalindromeQ[n]&&PrimeNu[n]==PrimeNu[IntegerReverse[n]]; Select[ Range[ 200],npnQ] (* Harvey P. Dale, Oct 26 2020 *)