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A141136
a(n) = prime(prime(A028815(n) - 1) - 1) - 1.
6
1, 2, 6, 28, 52, 112, 172, 270, 316, 420, 592, 700, 910, 1060, 1150, 1290, 1510, 1782, 1830, 2212, 2376, 2472, 2740, 2998, 3256, 3630, 3930, 4078, 4270, 4390, 4546, 5350, 5590, 5866, 6100, 6658, 6802, 7186, 7602, 7828, 8218, 8520, 8712, 9310, 9438, 9732
OFFSET
0,2
LINKS
FORMULA
a(n) = A000040(A000040(A000040(n)) - 1) - 1, with a(0) = 1. - G. C. Greubel, Aug 05 2024
MATHEMATICA
A141136[n_]:= With[{p=Prime}, If[n==0, 1, p[p[p[n]]-1]-1]];
Table[A141136[n], {n, 0, 60}] (* G. C. Greubel, Aug 05 2024 *)
PROG
(Magma)
p:=NthPrime;
A141136:= func< n | n eq 0 select 1 else p(p(p(n))-1) -1 >;
[A141136(n): n in [0..50]]; // G. C. Greubel, Aug 05 2024
(SageMath)
p=nth_prime
def A141136(n): return 1 if n==0 else p(p(p(n))-1)-1
[A141136(n) for n in range(51)] # G. C. Greubel, Aug 05 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Corrected and extended by D. S. McNeil, Mar 21 2009
Offset changed by G. C. Greubel, Aug 05 2024
STATUS
approved