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A078454
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Index of the first occurrence of prime(n) in A060324.
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1
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1, 3, 7, 13, 37, 31, 89, 51, 101, 219, 309, 973, 146, 832, 464, 1031, 2714, 2352, 6403, 311, 6397, 6352, 1487, 1439, 20718, 4252, 11958, 3719, 1332, 4136, 14509, 4601, 4223, 12414, 4043, 38862, 57949, 20257, 4958, 4832, 2213, 96792, 27932, 261337
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Smallest k such that k*prime(n) + k - 1 is a prime.
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LINKS
| Franklin T. Adams-Watters, Table of n, a(n) for n = 1..100
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PROG
| Contribution from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), May 25 2010: (Start)
(PARI) A060324(n)=forprime(q=2, 999999999, if(isprime(n*(q+1)-1), return(q))); -1
al(n)=local(v, k, xv); v=vector(n); while(n>0, xv=primepi(A060324(k++)); if(xv<=#v&v[xv]==0, v[xv]=k; n--)); v (End)
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CROSSREFS
| Cf. A060324.
Sequence in context: A152981 A112040 A084611 * A023212 A106952 A106951
Adjacent sequences: A078451 A078452 A078453 * A078455 A078456 A078457
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 23 2002
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EXTENSIONS
| More terms from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), May 25 2010
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