A046409 -id:A046409 - cp's OEIS frontend

A046329 Palindromes with exactly 3 prime factors (counted with multiplicity).

8, 44, 66, 99, 171, 212, 222, 242, 282, 292, 333, 343, 363, 404, 434, 474, 494, 555, 575, 595, 606, 646, 747, 777, 909, 969, 1001, 1221, 1331, 1551, 1771, 2222, 2882, 3333, 3553, 4334, 4994, 5335, 5555, 5665, 5885, 5995, 6226, 6446, 6886, 7337, 7557

Offset: 1

Patrick De Geest, Jun 15 1998

John Cerkan, Table of n, a(n) for n = 1..10000

Cf. A014612, A046316, A046409.

Select[Range[8000],PalindromeQ[#]&&PrimeOmega[#]==3&] (* Harvey P. Dale, Dec 24 2021 *)

A046393 Palindromes with exactly 3 distinct prime factors.

Original entry on oeis.org

66, 222, 282, 434, 474, 494, 555, 595, 606, 646, 777, 969, 1001, 1221, 1551, 1771, 2222, 2882, 3333, 3553, 4334, 4994, 5335, 5555, 5665, 5885, 5995, 6226, 6446, 6886, 7337, 7557, 7667, 7777, 7887, 8338, 8558, 8998, 9339, 9669, 9779, 9889, 11211

Offset: 1

Patrick De Geest, Jun 15 1998

The terms must have only three distinct prime factors even when counted with multiplicity. For example, 252 is not a term even though (1) it is a palindrome and (2) only three distinct primes occur when it is factored, because 252 = 2*2*3*3*7. - Harvey P. Dale, Aug 29 2016

Chai Wah Wu, Table of n, a(n) for n = 1..10000

Cf. A046329, A046409.

Select[Range[12000],#==IntegerReverse[#]&&PrimeNu[#]==PrimeOmega[#]==3&] (* Harvey P. Dale, Aug 29 2016 *)

A046377 Palindromes with exactly 3 palindromic prime factors (counted with multiplicity).

Original entry on oeis.org

8, 44, 66, 99, 242, 343, 363, 404, 606, 909, 1331, 2222, 2882, 3333, 5555, 6886, 7777, 12221, 15851, 20402, 26462, 30603, 37873, 39693, 112211, 145541, 167761, 226622, 248842, 339933, 347743, 662266, 664466, 668866, 682286, 993399, 996699, 1030301, 1246421

Offset: 1

Patrick De Geest, Jun 15 1998

			The palindrome 996699 is a term since it has 3 factors 3 11 30203, all palindromic.

Lars Blomberg, Table of n, a(n) for n = 1..1000

Cf. A046329, A046409.

More terms from Lars Blomberg, Nov 06 2015

cp's OEIS Frontend

A046329 Palindromes with exactly 3 prime factors (counted with multiplicity).

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A046393 Palindromes with exactly 3 distinct prime factors.

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A046377 Palindromes with exactly 3 palindromic prime factors (counted with multiplicity).

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