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A076887
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Sum of divisors of nonzero palindromic numbers.
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1
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1, 3, 4, 7, 6, 12, 8, 15, 13, 12, 36, 48, 84, 72, 144, 96, 180, 156, 102, 152, 133, 132, 192, 152, 192, 260, 182, 192, 306, 378, 456, 450, 399, 728, 396, 558, 576, 518, 408, 314, 360, 494, 400, 354, 532, 374, 384, 528, 714, 936, 810, 768, 1064, 684, 930, 960
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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a(11) = 36 because 36 is the sum of divisors of 11th nonzero palindromic number (i.e. 22).
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MATHEMATICA
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DivisorSigma[1, #]&/@Select[Range[500], PalindromeQ] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 06 2018 *)
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Both title and example clarified by Omar E. Pol, Dec 08 2019
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STATUS
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approved
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