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A165492
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Primes p where the digital sum of p^2 is equal to 13.
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7
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7, 29, 47, 61, 79, 151, 349, 389, 461, 601, 1051, 1249, 1429, 1451, 1789, 2239, 3499, 4799, 5011, 5101, 5501, 5749, 10501, 11149, 14249, 50101, 51001, 55001, 100501, 100649, 101149, 150001, 318751, 448999, 501001, 1009951, 5000011, 5000101, 5001001, 50000101
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OFFSET
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1,1
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LINKS
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Vincenzo Librandi and Hiroaki Yamanouchi, Table of n, a(n) for n = 1..61 (terms a(1)-a(44) from Vincenzo Librandi)
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FORMULA
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{A000040(i) : A123157(i) = 13}. [R. J. Mathar, Sep 29 2009]
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EXAMPLE
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29 is in the sequence because 29^2 = 841 and 8+4+1 = 13.
1789 is in the sequence because 1789^2 = 3200521 and 3+2+0+0+5+2+1 = 13.
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MATHEMATICA
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Select[Prime[Range[80000]], Total[IntegerDigits[#^2]]==13&] (* Harvey P. Dale, Apr 08 2011 *)
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PROG
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(MAGMA) [p: p in PrimesUpTo(5*10^7) | &+Intseq(p^2) eq 13]; // Vincenzo Librandi, Sep 26 2015
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CROSSREFS
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Cf. A165502 - A165504.
Sequence in context: A103603 A045465 A330723 * A084201 A031380 A005698
Adjacent sequences: A165489 A165490 A165491 * A165493 A165494 A165495
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KEYWORD
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nonn,base
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AUTHOR
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Vincenzo Librandi, Sep 21 2009
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EXTENSIONS
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More terms from R. J. Mathar, Sep 29 2009
a(37)-a(40) from Hiroaki Yamanouchi, Sep 23 2014
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STATUS
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approved
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