A344477 Primes that occur as p - (digit product of p) for p in A228139.

11, 17, 19, 31, 37, 59, 113, 173, 179, 193, 199, 211, 227, 233, 239, 241, 257, 263, 307, 311, 317, 331, 383, 389, 397, 419, 439, 479, 499, 521, 547, 563, 571, 577, 613, 617, 659, 691, 719, 733, 1117, 1153, 1171, 1193, 1201, 1213, 1279, 1319, 1399, 1447, 1483, 1493, 1511, 1531, 1543, 1609, 1871

Offset

1,1

Comments

Terms are unique and in numerical order.

There are terms that correspond to more than one member of A228139, such as 17 = 23-2*3 = 89-8*9.

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Example

a(5) = 37 is a term because 41 is prime with no digit 0 and 37 = 41-4*1.

Maple

d:= 4: # to get terms with at most d digits
M:= 10^d + 9^d:
f:= proc(n) local L, v;
  L:= convert(n, base, 10);
  if member(0, L) then return NULL fi;
  if isprime(n) then
    v:= n - convert(L, `*`);
    if isprime(v) then v fi
  fi
end proc:
sort(convert(select(`<`, map(f, {seq(i, i=11..M, 2)}), 10^d), list));

Crossrefs

Cf. A228139, A344466.

Sequence in context: A111257 A032677 A225677 * A230654 A226686 A217055

Adjacent sequences: A344474 A344475 A344476 * A344478 A344479 A344480

Keyword

nonn,base

Author

J. M. Bergot and Robert Israel, May 20 2021

Status

approved