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A034848 a(n) = 1 + 3*A034782(n). 1
73, 97, 103, 193, 229, 241, 277, 283, 313, 331, 367, 373, 397, 433, 457, 463, 547, 607, 619, 643, 661, 709, 727, 733, 739, 757, 823, 859, 883, 907, 967, 997, 1021, 1033, 1069, 1087, 1093, 1123, 1129, 1171, 1237, 1249, 1303, 1423, 1447, 1453, 1483, 1489, 1543, 1579, 1597 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = P(n,3) = 1 + 3*K(n,3) = 1 + 3*A034782(n). P(n,3) are special primes of the form 3k+1. The relevant values of k are given by A034782.

Note that, e.g., 13, 19, 31, 5, 13 are not in this sequence.

LINKS

Table of n, a(n) for n=1..51.

PROG

(PARI) a034693(n) = my(s=1); while(!isprime(s*n+1), s++); s;

isok(n) = a034693(n) == 3;

lista(nn) = {for (n=1, nn, if (isok(n), print1(3*n+1, ", ")); ); } \\ Michel Marcus, May 13 2018

CROSSREFS

Cf. A034693, A034694, A034782.

Sequence in context: A065111 A152308 A072052 * A168110 A139972 A268426

Adjacent sequences:  A034845 A034846 A034847 * A034849 A034850 A034851

KEYWORD

nonn

AUTHOR

Labos Elemer

EXTENSIONS

Corrected (wrong term 769 removed) and extended by Michel Marcus, May 13 2018

STATUS

approved

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Last modified August 19 09:46 EDT 2018. Contains 313860 sequences. (Running on oeis4.)