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A088465
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Primes whose leftmost decimal digit is 1 and whose other decimal digits are all 7s.
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1
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OFFSET
| 1,1
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COMMENTS
| In no element of this sequence can the number of 7's be congruent to 2 modulo 3
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LINKS
| Vladislav Avrutin, Prime pyramids
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MATHEMATICA
| Do[ a = 10^n + 7(10^n - 1)/9; If[ PrimeQ[a], Print[a]], {n, 1, 53}] (from Robert G. Wilson v Dec 05 2003)
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CROSSREFS
| The number of sevens in this sequence is given by A089147.
Sequence in context: A071826 A055414 A156675 * A001905 A135505 A171704
Adjacent sequences: A088462 A088463 A088464 * A088466 A088467 A088468
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KEYWORD
| base,easy,nonn
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AUTHOR
| Sam Alexander (amnalexander(AT)yahoo.com), Nov 12 2003
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