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A330670
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Squares of primes congruent to 1 (mod 30).
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0
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121, 361, 841, 961, 1681, 3481, 3721, 5041, 6241, 7921, 10201, 11881, 17161, 19321, 22201, 22801, 32041, 32761, 36841, 39601, 44521, 52441, 57121, 58081, 63001, 72361, 73441, 78961, 96721, 109561, 121801, 128881, 143641, 151321, 166801, 167281, 175561
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OFFSET
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1,1
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COMMENTS
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Sequence lists squares of prime numbers that end in 1 or 9.
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LINKS
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EXAMPLE
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Prime 11*11=121 and 19*19=361; 121 and 361 are terms of this sequence.
Prime 13*13=169 and 17*17=289; 169 and 289 are not terms of this sequence.
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MATHEMATICA
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Select[Range[360], PrimeQ[#] && Mod[#^2, 30] == 1 &]^2 (* Amiram Eldar, Dec 28 2019 *)
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PROG
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(PARI) isok(m) = issquare(m) && isprime(sqrtint(m)) && ((m % 30) == 1); \\ Michel Marcus, Dec 26 2019
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Deleted an incorrect crossreference. - Harry E. Neel, Jan 22 2020
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STATUS
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approved
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