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A065542
a(n) is smallest prime > 7*a(n-1), a(1) = 7.
0
7, 53, 373, 2617, 18329, 128311, 898181, 6287273, 44010929, 308076523, 2156535743, 15095750209, 105670251529, 739691760707, 5177842324987, 36244896274921, 253714273924549, 1775999917471859, 12431999422303051
OFFSET
1,1
MATHEMATICA
NextPrim[n_Integer] := Block[ {k = n + 1}, While[ !PrimeQ[k], k++ ]; Return[k]]; a[1] = 7; a[n_] := NextPrim[ 7*a[n - 1]]; Table[ a[n], {n, 1, 20} ]
NestList[NextPrime[7#]&, 7, 20] (* Harvey P. Dale, Apr 23 2019 *)
CROSSREFS
Sequence in context: A056590 A223778 A223712 * A279269 A015561 A133588
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Nov 28 2001
STATUS
approved