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A178773
Least palindrome which is the product of n consecutive primes.
0
1, 2, 6, 1001, 5005, 323323
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OFFSET
0,2
COMMENTS
A proper subset of
A169829
.
The next term must exceed the product of 6 primes whose prime index is at least 125000000.
LINKS
Table of n, a(n) for n=0..5.
FORMULA
a(3) = 1001 = 7*11*13,
a(4) = 5005 = 5*7*11*13,
a(5) = 323323 = 7*11*13*17*19.
MATHEMATICA
fQ[k_, n_] := Block[{j = Fold[ Times, 1, Prime[Range[k, k + n]]]}, j == FromDigits@ Reverse@ IntegerDigits@ j]; lst = {}; Do[k = 1; While[ ! fQ[k, n], k++ ]; Print[{n + 1, Fold[Times, 1, Prime[Range[k, k + n]]]}], {n, -1, 4}]
CROSSREFS
Sequence in context:
A047690
A113569
A252739
*
A046857
A129454
A317251
Adjacent sequences:
A178770
A178771
A178772
*
A178774
A178775
A178776
KEYWORD
base
,
nonn
AUTHOR
Robert G. Wilson v
, Jun 11 2010
STATUS
approved
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Last modified August 20 13:38 EDT 2024. Contains 375336 sequences. (Running on oeis4.)