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A090831 a(n) = prime(n)^1 + prime(n-1)^2 + prime(n-2)^3 + ... + prime(1)^n. 3
2, 7, 22, 75, 298, 1409, 7900, 52021, 397756, 3468667, 33656220, 354326769, 3970080798, 46804154165, 577838630958, 7468797926219, 101264140457250, 1443524097355225, 21670184170964846, 342875871451985761 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
a(5) = 11^1 + 7^2 + 5^3 + 3^4 + 2^5 = 11 + 49 + 125 + 81 + 32 = 298.
MAPLE
seq(add(ithprime(i)^(n-i+1), i=1..n), n=1..30); # Robert Israel, Mar 23 2021
MATHEMATICA
f[n_] := Sum[ Prime[i]^(n - i + 1), {i, n}]; Table[ f[n], {n, 1, 20}] (* Robert G. Wilson v, Feb 18 2004 *)
CROSSREFS
Cf. A000040.
Sequence in context: A204218 A007141 A278151 * A174403 A119975 A106188
KEYWORD
easy,nonn
AUTHOR
Felix Tubiana, Feb 16 2004
EXTENSIONS
More terms from Ray Chandler and Robert G. Wilson v, Feb 18 2004
STATUS
approved

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Last modified June 18 08:27 EDT 2024. Contains 373472 sequences. (Running on oeis4.)