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A085631
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Let b(n)=product of exponents of prime factorization of n. Sequence gives palindromes n such that b(n) is also palindromic and sets a new record.
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1, 4, 8, 252, 2112, 4224, 8448, 29592, 6547456, 27011072, 291080192, 276444444672, 2789387839872, 6399369639936, 631367020763136, 2306938998396032
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| No more terms < 1.45*10^14. - David Wasserman (wasserma(AT)spawar.navy.mil), Feb 07 2005
a(17) > 10^18. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 26 2010]
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EXAMPLE
| a(9)=6547456 because it is a palindrome and 6547456 = 2^11*23*139 and
11*1*1=11 a palindrome.
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CROSSREFS
| Cf. A005361.
Sequence in context: A013096 A200729 A116092 * A074073 A090653 A065022
Adjacent sequences: A085628 A085629 A085630 * A085632 A085633 A085634
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KEYWORD
| base,nonn
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AUTHOR
| Jason Earls and Amarnath Murthy (zevi_35711(AT)yahoo.com), Jul 10 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 07 2005
a(15)-a(16) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 26 2010
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