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Search: id:A101215
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| A101215 |
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Numbers n such that concatenation of n with 54321 is a prime. |
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1
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| 1, 13, 28, 31, 37, 44, 49, 55, 59, 68, 71, 77, 89, 94, 97, 104, 115, 119, 121, 139, 142, 145, 148, 161, 166, 178, 181, 191, 196, 199, 205, 226, 232, 233, 238, 241, 248, 251, 259, 262, 272
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Conjecture 1 : for any integer N ending in 1 or 3 or 7 or 9 there is an infinite sequence of numbers n such that the concatenation nN is a prime. Conjecture 2 : for any integer N there is an infinite sequence of numbers n such that the concatenation Nn is a prime
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EXAMPLE
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154321,1354321,2854321,3154321 ......... are primes
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CROSSREFS
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Adjacent sequences: A101212 A101213 A101214 this_sequence A101216 A101217 A101218
Sequence in context: A018946 A042397 A041336 this_sequence A138685 A047724 A046044
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KEYWORD
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nonn,base
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AUTHOR
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Pierre CAMI (pierrecami(AT)tele2.fr), Dec 14 2004
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