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A101735
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Indices of primes in sequence defined by A(0) = 43, A(n) = 10*A(n-1) + 53 for n > 0.
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0
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0, 3, 9, 11, 12, 39, 75, 122, 500, 647, 3540, 4001, 4227, 5270, 7431
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Numbers n such that (440*10^n - 53)/9 is prime.
Numbers n such that digit 4 followed by n >= 0 occurrences of digit 8 followed by digit 3 is prime.
Numbers corresponding to terms <= 647 are certified primes.
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REFERENCES
| Klaus Brockhaus and Walter Oberschelp, Zahlenfolgen mit homogenem Ziffernkern, MNU 59/8 (2006), pp. 462-467.
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LINKS
| Makoto Kamada, Factorizations of near-repdigit numbers.
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EXAMPLE
| 48883 is prime, hence 3 is a term.
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PROG
| (PARI) a=43; for(n=0, 1500, if(isprime(a), print1(n, ", ")); a=10*a+53)
(PARI) for(n=0, 1500, if(isprime((440*10^n-53)/9), print1(n, ", ")))
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CROSSREFS
| Cf. A000533, A002275.
a(n) = A102998(n) - 1.
Sequence in context: A174565 A074261 A059868 * A101620 A174813 A116444
Adjacent sequences: A101732 A101733 A101734 * A101736 A101737 A101738
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KEYWORD
| nonn,hard,more
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AUTHOR
| Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) and Walter Oberschelp (oberschelp(AT)informatik.rwth-aachen.de), Dec 14 2004
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EXTENSIONS
| More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 01 2008
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