login
A107121
Numbers n such that n=prime(prime(d_1*d_2*...*d_k)) where d_1 d_2 ... d_k is the decimal expansion of n.
2
461, 264961, 9548491, 14738827
OFFSET
1,1
COMMENTS
If n is in the sequence then pi(n) = prime(d_1*d_2*...*d_k) where d_1 d_2 ... d_k is the decimal expansion of n, so this sequence is a subsequence of A107120. There is no further term up to prime(2*10^7).
EXAMPLE
14738827 is in the sequence because 14738827=prime(prime(1*4*7*3*8*8*2*7)).
MATHEMATICA
Do[h= IntegerDigits[Prime[m]]; l = Length[h]; If[Min[h] > 0 && m == Prime[Product[h[[k]], {k, l}]], Print[Prime [m]]], {m, 20000000}]
CROSSREFS
KEYWORD
base,nonn,more
AUTHOR
Farideh Firoozbakht, May 13 2005
STATUS
approved