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A089986
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Numbers n such that 4n + 7 is prime.
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3
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-1, 0, 1, 3, 4, 6, 9, 10, 13, 15, 16, 18, 19, 24, 25, 30, 31, 33, 36, 39, 40, 43, 46, 48, 51, 54, 55, 58, 61, 64, 66, 69, 75, 76, 81, 85, 88, 90, 93, 94, 103, 106, 108, 109, 114, 115, 118, 120, 121, 123, 124, 129, 135, 139, 141, 145, 148, 150, 153, 156, 159, 160, 163, 169
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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REFERENCES
| M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988.
Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997.
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FORMULA
| a(n) = A005099(n)-2.
a(n) = A095278(n)-1.
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PROG
| (MAGMA) [ n: n in [-1..170] | IsPrime(4*n+7) ];
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CROSSREFS
| Cf. A005099 ((( Primes = -1 mod 4 ) + 1)/4), A005098 (4n+1 is prime), A095278 (4n+3 is prime), A111215 (4n+5 is prime).
Sequence in context: A050131 A191326 A191185 * A101448 A005122 A166161
Adjacent sequences: A089983 A089984 A089985 * A089987 A089988 A089989
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KEYWORD
| sign
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jan 13 2
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EXTENSIONS
| Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 22 2008
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