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Search: id:A085924
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| A085924 |
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If k = product (p_i)^(r_i), where p_i are primes in increasing order, then k is a member if concatenation of r_i forms a palindrome. |
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2
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| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 21, 22, 23, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 46, 47, 49, 51, 53, 55, 57, 58, 59, 61, 62, 64, 65, 66, 67, 69, 70, 71, 73, 74, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89, 90, 91, 93, 94, 95
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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2^10 is the first member of A072774 that is not in this sequence. - David Wasserman (wasserma(AT)spawar.navy.mil), Feb 11 2005
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EXAMPLE
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15 is a member as 15 = 3^1*5^1 and 11 is a palindrome.
90 is a member as 90 = 2^1*3^2*5^1 and 121 is a palindrome.
84 is not a member as 84 = 2^2*3^1*7^1, 211 is not a palindrome.
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CROSSREFS
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Cf. A072774, A103653.
Sequence in context: A065200 A107909 A067340 this_sequence A072774 A062770 A085156
Adjacent sequences: A085921 A085922 A085923 this_sequence A085925 A085926 A085927
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy and Jason Earls (amarnath_murthy(AT)yahoo.com), Jul 12 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 11 2005
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