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 A198188 Primes from the decimal expansion of e, sorted first by the final digit index and then by length. 2
 2, 7, 71, 271, 2, 281, 2718281, 2, 5, 59, 5, 2, 3, 23, 523, 4523, 904523, 5, 3, 53, 353, 8284590452353, 2, 7, 360287, 28459045235360287, 7, 47, 8747, 6028747, 8182845904523536028747, 71, 360287471, 8281828459045235360287471, 3, 13, 74713, 82818284590452353602874713 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS M. F. Hasler, Table of n, a(n) for n = 1..655 EXAMPLE The first digit, 2, is prime, so a(1) = 2. The second digit, 7, is prime, so a(2) = 7. 27 is not prime. The third digit, 1, is not prime, but 71 and 271 are, so a(3) = 71 and a(4) = 271. a(17) shows that "leading zeros are not allowed", i.e., if a prime p is prefixed by a 0 then it is not listed twice. - M. F. Hasler, Feb 05 2012 PROG (PARI) v=[2, 7, 1, 8, 2, 8, 1, 8, 2, 8, 4, 5, 9, 0, 4, 5, 2, 3, 5, 3, 6, 0, 2, 8, 7, 4, 7, 1, 3] for(n=1, #v, x=0; p=1; forstep(k=n, 1, -1, x+=p*v[k]; p*=10; if(v[k]&&isprime(x), print1(x", ")))) (PARI) default(realprecision, D=300); for(i=0, D-5, E=exp(1)\.1^i; for(j=1, i+1, ispseudoprime(t=E%10^j) & t!=L print1(L=t", ")))  \\ M. F. Hasler, Feb 05 2012 CROSSREFS Cf. A095935. Sequence in context: A165978 A106917 A188665 * A230459 A267406 A100360 Adjacent sequences:  A198185 A198186 A198187 * A198189 A198190 A198191 KEYWORD nonn,base AUTHOR Franklin T. Adams-Watters, Oct 21 2011 STATUS approved

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Last modified August 11 00:55 EDT 2022. Contains 356046 sequences. (Running on oeis4.)