A097640 - OEIS

A097640

Numbers n such that n=(d_1+d_2+...+d_k)*prime(d_1+d_2+...+d_k) where d_1 d_2 ... d_k is the decimal expansion of n.

152, 207, 444, 1098

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OFFSET

1,1

LINKS

EXAMPLE

444 is in the sequence because 444=(4+4+4)*prime(4+4+4).

MATHEMATICA

denQ[n_]:=Module[{tidn=Total[IntegerDigits[n]]}, n==tidn Prime[tidn]]; Select[Range[1100], denQ] (* Harvey P. Dale, May 08 2012 *)

CROSSREFS

KEYWORD

base,fini,full,nonn

AUTHOR

STATUS

approved