This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A185300 Numbers n such that (sum of the decimal digits of n) + (product of the decimal digits of n) is prime. 2
 1, 11, 12, 13, 15, 16, 18, 19, 20, 21, 23, 25, 27, 29, 30, 31, 32, 34, 35, 37, 43, 45, 50, 51, 52, 53, 54, 56, 57, 58, 59, 61, 65, 70, 72, 73, 75, 78, 79, 81, 85, 87, 89, 91, 92, 95, 97, 98, 101, 102, 104, 106, 110, 120, 140, 160, 200, 201, 203, 205, 209, 210, 223, 225, 230, 232 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE 236 is in the sequence because 2+3+6 + 2*3*6 = 11 + 36 = 47 is prime. MAPLE A007953 := proc(n) add(d, d=convert(n, base, 10)) ; end proc: A007954 := proc(n) mul(d, d=convert(n, base, 10)) ; end proc: isA185300 := proc(n) isprime(A007953(n)+A007954(n)) ; end proc: for n from 1 to 300 do if isA185300(n) then printf("%a, ", n) ; end if; end do: # R. J. Mathar, Feb 08 2011 PROG (MAGMA) [n: n in [1..232] | IsPrime(&+Intseq(n)+&*Intseq(n))]; // Bruno Berselli, Aug 02 2012 CROSSREFS Cf. A007953, A007954. Sequence in context: A138595 A192271 A214423 * A097932 A031300 A111019 Adjacent sequences:  A185297 A185298 A185299 * A185301 A185302 A185303 KEYWORD nonn,base,easy AUTHOR Michel Lagneau, Feb 03 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .