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A108819
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Primes such that the outer 2 digits are n and n+1 and all inner digits are 2, where 0 < n < 9.
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0
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223, 829, 822229, 22222223, 822222229, 22222222223, 62222222222227, 822222222222229, 222222222222222222222222222222222223, 82222222222222222222222222222222222222222222222222222229
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(x) = 10^(x+1)*n+floor(10^x*2/9)*10+n+1. Output if a(x) is prime.
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PROG
| (PARI) n10np1(n) = { local(x, y, k); for(x=1, n, for(k=1, 8, y=10^(x+1)*k+floor(10^x*2/9)*10+k+1; if(isprime(y), print1(y", ")) ) ) }
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CROSSREFS
| Sequence in context: A142773 A096660 A094459 * A158226 A205273 A205266
Adjacent sequences: A108816 A108817 A108818 * A108820 A108821 A108822
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KEYWORD
| easy,nonn,base
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AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Jul 11 2005
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