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A102544
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Numbers n such that n777777 is prime.
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2
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16, 20, 43, 50, 61, 62, 64, 83, 85, 100, 101, 103, 109, 113, 124, 131, 134, 136, 137, 139, 142, 145, 158, 160, 164, 172, 181, 197, 202, 205, 206, 251, 256, 262, 268, 272, 278, 289, 295, 298, 307, 310, 314, 316, 326, 347, 349, 359, 361, 362, 368, 373, 400, 419, 428, 431, 433, 437, 445
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| If n=16, then n777777 = 16777777 (prime).
If n=85, then n777777 = 85777777 (prime).
If n=124, then n777777 = 124777777 (prime).
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PROG
| [ n: n in [1..700] | IsPrime(Seqint([7, 7, 7, 7, 7, 7] cat Intseq(n))) ]; [From Vincenzo Librandi, Feb 04 2011]
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CROSSREFS
| Sequence in context: A161424 A088449 A104010 * A152022 A188242 A103330
Adjacent sequences: A102541 A102542 A102543 * A102545 A102546 A102547
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KEYWORD
| base,nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Feb 24 2005
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EXTENSIONS
| More terms from Vincenzo Librandi, Feb 04 2011
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