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Search: id:A098826
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| A098826 |
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Palindromes that are 1 more than a prime and 1 less than a triangular number. |
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+0
1
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| 44, 252, 434, 464, 4004, 46664, 2005002, 49099094, 414878414, 431313134, 4370654560734, 200000050000002, 417622181226714, 202837977779738202, 2574289191919824752
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(1) = 44 because 44 is the smallest (first) palindrome that is 1 more than a prime (43) and 1 less than a triangular number (45).
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MATHEMATICA
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Do[t = n(n + 1)/2 - 1; If[EvenQ[t], If[PrimeQ[t - 1], If[t == FromDigits[ Reverse[ IntegerDigits[ t]]], Print[t]]]], {n, 10^9}] (from Robert G. Wilson v Nov 04 2004)
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CROSSREFS
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Sequence in context: A122235 A122245 A031175 this_sequence A060836 A135182 A094794
Adjacent sequences: A098823 A098824 A098825 this_sequence A098827 A098828 A098829
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KEYWORD
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base,nonn
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AUTHOR
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Anonymous, Nov 02 2004
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