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 A344477 Primes that occur as p - (digit product of p) for p in A228139. 1
 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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified June 22 22:09 EDT 2024. Contains 373618 sequences. (Running on oeis4.)