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 A110775 Number of digits in A110774(n). 15
 2, 1, 2, 2, 7, 10, 101, 196, 9, 550, 6150, 4532, 3249 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..13. PROG (Python) from sympy import isprime from itertools import count, islice def agen(): # generator of terms s = "" while True: for d in "13": for k in count(1): if isprime(int(s+d*k)): break yield k s += d*k print(list(islice(agen(), 10))) # Michael S. Branicky, Aug 23 2022 CROSSREFS Cf. A110774, A110776, A110777, A110778, A112534, A110780, A110781, A110782, A110783, A110788, A110789 Sequence in context: A145859 A145863 A240492 * A229232 A092186 A138262 Adjacent sequences: A110772 A110773 A110774 * A110776 A110777 A110778 KEYWORD base,nonn,more AUTHOR Amarnath Murthy, Aug 12 2005 EXTENSIONS Corrected and extended by Joshua Zucker, Jan 11 2006 a(11) from Michael S. Branicky, Aug 23 2022 a(12)-a(13) from Michael S. Branicky, May 29 2023 STATUS approved

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Last modified August 4 01:40 EDT 2024. Contains 374905 sequences. (Running on oeis4.)