A080822 Primes in A058633.

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

Offset

1,1

Links

Table of n, a(n) for n=1..43.

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) }

Crossrefs

Cf. A058633.

Sequence in context: A289735 A321133 A055821 * A068363 A351377 A165286

Adjacent sequences: A080819 A080820 A080821 * A080823 A080824 A080825

Keyword

easy,nonn

Author

Cino Hilliard, Mar 26 2003

Extensions

Edited by Hauke Worpel and N. J. A. Sloane, Jun 03, 2003

Status

approved