1,2

Table of n, a(n) for n=1..67.

1234 is a term because 4*(1+2+3+4)+1 = 41.

Select[Range[130], PrimeQ[Total[IntegerDigits[#]]IntegerLength[ #]+ 1]&] (* Harvey P. Dale, Jul 12 2011 *)

Cf. A110805.

Sequence in context: A089227 A204660 A275956 * A056077 A249428 A129630

Adjacent sequences: A109130 A109131 A109132 * A109134 A109135 A109136

base,easy,nonn

Jason Earls, Aug 17 2005

approved