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A080830 Primes that terminate at 68,34,17 in the 3x-1 problem: Repeat, if x is even divide by 2 else multiply by 3 and subtract 1, until 17 is reached. 0
17, 23, 31, 37, 41, 61, 67, 73, 83, 109, 131, 163, 179, 197, 229, 233, 239, 257, 263, 277, 293, 311, 313, 331, 337, 349, 389, 439, 443, 449, 457, 467, 491, 521, 523, 557, 577, 587, 599, 641, 659, 661, 673, 677, 701, 739, 743, 757, 761, 769, 773, 787, 829, 877 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
PROG
(PARI) px3nm1(n, p) = { forprime(x=2, n, p1 = x; while(p1>1, if(p1%2==0, p1/=2, p1 = p1*p-1; ); if(p1 == 5 || p1==17, break); ); if(p1 == 17, print1(x" ")) ) }
CROSSREFS
Sequence in context: A330600 A217044 A145484 * A165566 A072184 A107644
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Mar 27 2003
STATUS
approved

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Last modified March 19 09:40 EDT 2024. Contains 370981 sequences. (Running on oeis4.)