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Search: id:A004614
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| A004614 |
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Numbers that are divisible only by primes congruent to 3 mod 4. |
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+0
9
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| 1, 3, 7, 9, 11, 19, 21, 23, 27, 31, 33, 43, 47, 49, 57, 59, 63, 67, 69, 71, 77, 79, 81, 83, 93, 99, 103, 107, 121, 127, 129, 131, 133, 139, 141, 147, 151, 161, 163, 167, 171, 177, 179, 189, 191, 199, 201, 207, 209, 211, 213, 217, 223, 227, 231, 237, 239, 243, 249, 251
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Numbers whose factorization as Gaussian integers is the same as their factorization as integers. - Frank Adams-Watters (FrankTAW(AT)Netscape.net), Oct 14 2005
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..10000
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PROGRAM
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(PARI) for(n=1, 1000, if(sumdiv(n, d, isprime(d)*if((d-3)%4, 1, 0))==0, print1(n, ", ")))
(PARI) forstep(n=1, 999, 2, for(j=1, #t=factor(n)[, 1], t[j]%4==1&next(2)); print1(n", ")) - M. F. Hasler (MHasler(AT)univ-ag.fr), Feb 26 2008
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CROSSREFS
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Cf. A004613.
Sequence in context: A156770 A088630 A129747 this_sequence A112398 A167800 A003538
Adjacent sequences: A004611 A004612 A004613 this_sequence A004615 A004616 A004617
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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