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Index of the first occurrence of n-th prime in Van Eck's sequence (A181391), or 0 if n-th prime never appears.
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%I #55 Nov 09 2022 10:42:17

%S 5,20,12,66,44,121,41,89,101,225,72,92,548,199,297,1486,490,1001,735,

%T 455,420,611,772,673,187,1612,3690,581,417,2584,7574,162,1483,1048,

%U 689,330,1320,4007,3739,2884,528,3376,3045,3658,2869,411,935,303,1751,1122,376,5506,599,13191,494

%N Index of the first occurrence of n-th prime in Van Eck's sequence (A181391), or 0 if n-th prime never appears.

%C The first 85669653 terms exist and are less than 10^12, see A181391. - _Charles R Greathouse IV_, Nov 09 2022

%F a(n) > prime(n). - _Charles R Greathouse IV_, Nov 09 2022

%e a(3) = 12 because position 12 of Van Eck's sequence (A181391) is the first occurrence of 3rd prime number, i.e., 5.

%Y Cf. A181391.

%K nonn

%O 1,1

%A _G. L. Honaker, Jr._, Nov 08 2022