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23, 61, 67, 137, 149, 233, 547, 701, 709, 887, 1583, 1723, 1777, 2239, 2459, 2477, 2693, 3067, 3167, 3329, 3881, 3947, 3967, 4073, 5333, 5449, 5839, 6217, 6709, 6833, 8221, 8273, 8501, 8527, 8641, 9227, 9341, 10193, 10729, 10771, 11939, 12197, 12347
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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PROG
| (PARI) xpcount(n, p) = { ct=0; sr=0; for(x=1, n, p1 = x; while(p1>1, if(p1%2==0, p1/=2; ct++, p1 = p1*p+1; ct++) ); if(isprime(ct), print1(ct" "); sr+=1.0/ct) ); print(); print(sr) }
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CROSSREFS
| Cf. A058633.
Sequence in context: A142107 A107208 A055821 * A068363 A165286 A031342
Adjacent sequences: A080819 A080820 A080821 * A080823 A080824 A080825
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KEYWORD
| easy,nonn
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AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Mar 26 2003
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EXTENSIONS
| Edited by Hauke Worpel and N. J. A. Sloane (njas(AT)research.att.com), Jun 03, 2003
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