A078454 Index of the first occurrence of prime(n) in A060324.

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

Offset

1,2

Comments

Smallest k such that k*prime(n) + k - 1 is a prime.

Links

Franklin T. Adams-Watters, Table of n, a(n) for n = 1..100

Prog

Contribution from Franklin T. Adams-Watters, 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)

Crossrefs

Cf. A060324.

Sequence in context: A358560 A222187 A084611 * A023212 A106952 A106951

Adjacent sequences: A078451 A078452 A078453 * A078455 A078456 A078457

Keyword

nonn

Author

Amarnath Murthy, Dec 23 2002

Extensions

More terms from Franklin T. Adams-Watters, May 25 2010

Status

approved