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A094180
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Numbers n such that 4n-1 is divisible only by primes of form 4m-1 (i.e. by the Gaussian primes A002145).
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1
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1, 2, 3, 5, 6, 7, 8, 11, 12, 15, 16, 17, 18, 20, 21, 25, 26, 27, 32, 33, 35, 37, 38, 41, 42, 43, 45, 48, 50, 52, 53, 56, 57, 58, 60, 61, 63, 66, 68, 70, 71, 77, 78, 83, 86, 87, 90, 91, 92, 95, 96, 97, 100, 105, 106, 108, 110, 111, 116, 117, 120, 121, 122, 123, 125, 126, 131
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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PROG
| (PARI) {for(n=1, 140, fac=factor(4*n-1); v=vector(matsize(fac)[1], j, fac[j, 1])%4; if(vecmin(v)==3, print1(n, ", ")))}
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CROSSREFS
| For the actual numbers 4n-1, see A094179.
Sequence in context: A161873 A080220 A028778 * A116545 A140661 A063966
Adjacent sequences: A094177 A094178 A094179 * A094181 A094182 A094183
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KEYWORD
| nonn
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), May 06 2004
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EXTENSIONS
| More terms and PARI code from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), May 08 2004
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