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#148 by Yunhan Shi at Mon Mar 06 00:24:15 EST 2023
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Discussion
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| Mon Mar 06
| 00:27
| Yunhan Shi: this fixes rev148: https://oeis.org/history/view?seq=A002385&v=148
by adding (no replacement) the sorted array.
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#147 by Michel Marcus at Fri Mar 03 10:57:46 EST 2023
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A002385 = [11]+[*filter(isprime, (int(str(x) + str(x)[-2::-1]) for x in range(10**5)))] # _Yunhan Shi_, Mar 3 2023
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nonn,base,nice,easy,changed
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| STATUS
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proposed
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#146 by Yunhan Shi at Fri Mar 03 10:24:40 EST 2023
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Discussion
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| Fri Mar 03
| 10:55
| Michael S. Branicky: if it is not sorted, then it does not produce this sequence
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| 10:55
| Michel Marcus: yes BUT you are not supposed to delete existing program
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| 10:56
| Michel Marcus: and Mar 3 2023 should be Mar 03 2023
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| 10:57
| Michel Marcus: and seeing Michael discussion; I guess it will be easier if I revert your edit
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| 10:57
| Michel Marcus: you can come back again and ADD your program if you want
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#145 by Yunhan Shi at Fri Mar 03 10:23:11 EST 2023
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A002385 = [11]+[*filter(isprime, (int(str(x) + str(x)[-2::-1]) for x in range(10**4)))] # Yunhan Shi, Mar 3 2023
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Discussion
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| Fri Mar 03
| 10:24
| Yunhan Shi: Hi all. I found a much shorter python code to generate the same sequence. (I didn't sort it)
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#144 by Yunhan Shi at Fri Mar 03 10:21:19 EST 2023
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from itertools import chain
A002385 = sorted((n for n in chain((int(str(x)+str(x)[::-1]) for x in range(1, 10**5)), (int(str(x)+str(x)[-2::-1]) for x in range(1, 10**5))) if isprime(n))) # _Chai Wah Wu_, Aug 16 2014
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| STATUS
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approved
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#143 by Michael De Vlieger at Fri Apr 01 20:18:56 EDT 2022
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#142 by Michael De Vlieger at Fri Apr 01 20:18:53 EDT 2022
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| LINKS
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Ernest G. Hibbs, <a href="https://www.proquest.com/openview/4012f0286b785cd732c78eb0fc6fce80">Component Interactions of the Prime Numbers</a>, Capitol Technology Univ. (2022), see p. 33.
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| STATUS
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reviewed
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#141 by Michel Marcus at Fri Apr 01 14:58:21 EDT 2022
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#140 by Michael De Vlieger at Fri Apr 01 14:33:13 EDT 2022
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#139 by Michael De Vlieger at Fri Apr 01 14:33:11 EDT 2022
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| LINKS
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W. D. Banks, D. N. Hart, M. Sakata, <a href="http://dx.doi.org/10.4310/MRL.2004.v11.n6.a10">Almost all palindromes are composite</a>, Math. Res. Lett., 11 No. 5-6 (2004), 853-868.
Phakhinkon Phunphayap, Prapanpong Pongsriiam, <a href="https://arxiv.org/abs/1803.09621">Reciprocal sum of palindromes</a>, arXiv:1803.00161 [math.CA], 2018.
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| STATUS
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approved
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