The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A126802 Numbers n =d1+10d2+100d3+...+10^p dp such that "prime(1)*d1+prime(2)*d2+...+prime(p)*dp" is prime. 1
 1, 10, 11, 12, 14, 15, 17, 18, 31, 32, 34, 35, 37, 51, 52, 54, 57, 58, 71, 74, 75, 78, 91, 92, 95, 97, 98, 100, 101, 103, 104, 106, 107, 109, 120, 121, 123, 124, 126, 129, 140, 141, 143, 146, 147, 160, 163, 164, 167, 169, 180, 181, 184, 186, 187, 189, 210, 212, 213 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Numbers n such that A263042(n) is prime. - Robert Israel, May 07 2020 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 FORMULA For example 387 gives 7*2+8*3+3*5=53, a prime. MAPLE filter:= proc(n) local L, i;    L:= convert(n, base, 10);    isprime(add(L[i]*P[i], i=1..nops(L))); end proc: select(filter, [\$1..100]); # Robert Israel, May 07 2020 CROSSREFS Cf A263042. Includes A011557. Sequence in context: A058948 A108584 A098605 * A075775 A262393 A031089 Adjacent sequences:  A126799 A126800 A126801 * A126803 A126804 A126805 KEYWORD nonn,base AUTHOR Yalcin Aktar, Feb 21 2007 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 9 15:34 EDT 2021. Contains 343742 sequences. (Running on oeis4.)