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A100688 a(n) = prime(n) * 3^prime(n) - 1. 0
17, 80, 1214, 15308, 1948616, 20726198, 2195382770, 22082967872, 2165293113020, 1990280943581606, 19147875284802356, 16660504517966902430, 1495392851464002242522, 14115049597965094337960, 1249674274871002654525988, 1027312020387041054530226318 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
a(1) = 2*3^2 - 1 = 17.
MATHEMATICA
Do[Print[Prime[n]*3^(Prime[n]) - 1], {n, 1, 20}] (* Stefan Steinerberger, Feb 15 2006 *)
# 3^#-1&/@Prime[Range[20]] (* Harvey P. Dale, Jan 24 2012 *)
PROG
(Magma) [NthPrime(n)*3^NthPrime(n) - 1: n in [1..20]]; // Vincenzo Librandi, Aug 27 2015
CROSSREFS
Cf. A060352.
Sequence in context: A338549 A060934 A228602 * A044204 A044585 A347501
KEYWORD
nonn
AUTHOR
Parthasarathy Nambi, Dec 07 2004
EXTENSIONS
More terms from Stefan Steinerberger, Feb 15 2006
a(15)-a(16) from Vincenzo Librandi, Aug 27 2015
STATUS
approved

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Last modified April 16 17:08 EDT 2024. Contains 371749 sequences. (Running on oeis4.)