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A137980 Numbers k such that k^0 + (k+1)^1 + (k+2)^2 + (k+3)^3 + (k+4)^4 + (k+5)^5 + (k+6)^6 + (k+7)^7 is a prime. 1
4, 24, 28, 90, 112, 232, 310, 346, 480, 492, 522, 564, 592, 648, 666, 690, 694, 766, 802, 856, 868, 900, 930, 960, 990, 1030, 1038, 1060, 1102, 1134, 1212, 1218, 1240, 1264, 1308, 1446, 1522, 1570, 1578, 1704, 1822, 1852, 1858, 1866, 1882, 1896, 1906, 1912, 1978, 1990 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
a={}; Do[If[PrimeQ[n^70+(n+1)^1+(n+2)^2+(n+3)^3+(n+4)^4+(n+5)^5+(n+6)^6+(n+7)^7], AppendTo[a, n]], {n, 10^3}]; a
PROG
(PARI) is(n)={isprime(sum(k=0, 7, (n+k)^k))}
select(is, [1..2000]) \\ Andrew Howroyd, Feb 02 2020
CROSSREFS
Sequence in context: A303333 A324517 A370493 * A348299 A144137 A238222
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified May 26 13:41 EDT 2024. Contains 372826 sequences. (Running on oeis4.)