A324041 Nonpalindromic integers with palindromic product of divisors.

26, 49, 2285, 1109111, 3069307, 12028229, 12866669, 110091011, 10207355549, 11010911011, 11100910111, 13579355059, 30101273647, 30693069307, 111283619361

Offset: 1

Author

Michel Marcus, Sep 02 2019

Keywords

• nonn
• base
• more

Comments

Many terms of A327325 are palindromes, hence this sequence.

Intersection of A029742 and A327325.

a(16) > 3.5*10^11. - Giovanni Resta, Sep 04 2019

Examples

			Divisors of 26 are : 1,2,13,26 and 1*2*13*26=676.
		

Crossrefs

Cf. A002113, A007955, A029742, A327325.

Programs

Mathematica

Select[Range[3200000], !PalindromeQ[#] && PalindromeQ[#^(DivisorSigma[0, #]/2)] &] (* Amiram Eldar, Sep 02 2019 *)

PARI

ispal(n) = my(d=digits(n)); d == Vecrev(d);
isok(n) = !ispal(n) && ispal(vecprod(divisors(n)));

Extensions

a(8)-a(15) from Giovanni Resta, Sep 04 2019