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A102764
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Numbers n such that n7777777 is prime.
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0
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13, 19, 30, 34, 43, 52, 54, 57, 58, 64, 69, 78, 82, 94, 96, 124, 145, 148, 157, 165, 177, 178, 187, 192, 195, 201, 202, 243, 246, 250, 256, 264, 277, 291, 303, 307, 313, 319, 324, 325, 340, 342, 352, 355, 382, 393, 397, 402, 409, 429, 430, 432, 444, 456, 468, 474, 486, 493, 499, 517
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| If n=13, then n7777777 = 137777777 (prime).
If n=57, then n7777777 = 577777777 (prime).
If n=96, then n7777777 = 967777777 (prime).
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PROG
| (MAGMA) [ n: n in [1..700] | IsPrime(Seqint([7, 7, 7, 7, 7, 7, 7] cat Intseq(n))) ]; // From Vincenzo Librandi, Feb 03 2011
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CROSSREFS
| Sequence in context: A101849 A141562 A108097 * A164318 A092738 A115093
Adjacent sequences: A102761 A102762 A102763 * A102765 A102766 A102767
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KEYWORD
| base,nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Feb 25 2005
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