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A370009
a(n) is the least prime greater than 3*prime(n).
1
7, 11, 17, 23, 37, 41, 53, 59, 71, 89, 97, 113, 127, 131, 149, 163, 179, 191, 211, 223, 223, 239, 251, 269, 293, 307, 311, 331, 331, 347, 383, 397, 419, 419, 449, 457, 479, 491, 503, 521, 541, 547, 577, 587, 593, 599, 641, 673, 683, 691, 701, 719, 727, 757
OFFSET
1,1
FORMULA
a(n) = A151800(A001748(n)).
EXAMPLE
5 < 3*2 < 7 < 3*3 < 11 < 13 < 3*5 < 17, so (a(1), a(2), a(3)) = (7,11,17).
MATHEMATICA
Table[NextPrime[Prime[PrimePi[3*Prime[n]]]], {n, 1, 200}]
PROG
(PARI) a(n) = nextprime(3*prime(n)); \\ Michel Marcus, Feb 10 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Feb 09 2024
STATUS
approved