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Search: id:A107612
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| A107612 |
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Primes with digital product = 2. |
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+0
13
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| 2, 211, 2111, 111121, 111211, 112111, 1111211, 1111111121, 1111211111, 1121111111, 111111211111, 111211111111, 2111111111111, 111111111111112111, 111111112111111111, 111111211111111111, 112111111111111111
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Corresponding indices of primes in A107611. Cf. A053666, A101987.
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FORMULA
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A107612(n) = prime(A107611(n))
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MAPLE
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for i from 0 to 30 do it:=sum(10^j, j=0..i): for k from 0 to i do if isprime(it+10^k) then printf(`%d, `, it+10^k) fi: od:od: (Sellers)
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MATHEMATICA
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Flatten[ Table[ Select[ Sort[ FromDigits /@ Permutations[ Flatten[{2, Table[1, {n}]}]]], PrimeQ[ # ] &], {n, 0, 19}]] (from Robert G. Wilson v (rgwv(AT)rgwv.com), May 19 2005)
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CROSSREFS
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Cf. A053666, A101987, A107611.
Cf. A004022, A107689, A107690, A107691, A107692, A107693, A107694, A107695, A107696, A107697, A107698.
Sequence in context: A056065 A050445 A106100 this_sequence A090560 A078280 A125058
Adjacent sequences: A107609 A107610 A107611 this_sequence A107613 A107614 A107615
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KEYWORD
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base,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), May 17 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com) and James Sellers (sellersj(AT)math.psu.edu), May 19 2005
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