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A081429 Class 10- primes. 14
138197, 207227, 621679, 621883, 633383, 760079, 829177, 863711, 898253, 978863, 1035499, 1036471, 1209191, 1451059, 1566179, 1658309, 1658353, 1761407, 1794229, 1796503, 1827479, 1900147, 2015303, 2029439, 2070997, 2072893 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, A18.

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..1188

MATHEMATICA

PrimeFactors[n_Integer] := Flatten[Table[ #[[1]], {1}] & /@ FactorInteger[n]]; f[n_Integer] := Block[{m = n}, If[m == 0, m = 1, While[ IntegerQ[m/2], m /= 2]; While[ IntegerQ[m/3], m /= 3]]; Apply[Times, PrimeFactors[m] - 1]]; ClassMinusNbr[n_] := Length[NestWhileList[f, n, UnsameQ, All]] - 3; Prime[ Select[ Range[200000], ClassMinusNbr[ Prime[ # ]] == 10 &]]

CROSSREFS

Cf. A005113, A056637, A005109, A005110, A005111, A005112, A081424, A081425, A081426, A081427, A081428, A081430.

Sequence in context: A025320 A025293 A025311 * A236662 A251979 A224586

Adjacent sequences:  A081426 A081427 A081428 * A081430 A081431 A081432

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Mar 20 2003

STATUS

approved

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Last modified November 14 07:13 EST 2019. Contains 329111 sequences. (Running on oeis4.)