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 A198190 Primes from the decimal expansion of sqrt(2), sorted first by the final digit index and then by length. 0
 41, 2, 421, 3, 13, 5, 2, 3, 23, 5623, 135623, 42135623, 4142135623, 7, 37, 56237, 3, 73, 373, 3562373, 213562373, 7309, 37309, 5, 5048801, 414213562373095048801, 7, 887, 488016887, 142135623730950488016887, 2, 2, 688724209, 414213562373095048801688724209 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE The first digit, 1, is not prime. The second digit, 4, cannot terminate any prime. The third digit, 1, is not prime, but 41 is, so a(1) = 41. 141 is not prime, so it is not in the sequence. PROG (PARI) v=[1, 4, 1, 4, 2, 1, 3, 5, 6, 2, 3, 7, 3, 0, 9, 5, 0, 4, 8, 8, 0, 1, 6, 8, 8, 7, 2, 4, 2, 0, 9, 6, 9] 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", ")))) CROSSREFS Cf. A002193. Sequence in context: A283895 A051317 A036189 * A106424 A126636 A095188 Adjacent sequences:  A198187 A198188 A198189 * A198191 A198192 A198193 KEYWORD nonn,base AUTHOR Franklin T. Adams-Watters, Oct 21 2011 STATUS approved

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Last modified August 14 15:34 EDT 2022. Contains 356122 sequences. (Running on oeis4.)