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A090933
Primes such that most significant digit swapped with all other digits yields primes.
1
2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, 79, 97, 101, 107, 113, 131, 149, 167, 179, 181, 191, 199, 311, 337, 373, 389, 701, 709, 727, 733, 739, 751, 757, 787, 797, 907, 919, 937, 941, 953, 991, 1009, 1013, 1031, 1049, 1051, 1091, 1123, 1181, 1319, 1321, 1381
OFFSET
1,1
Appears to be denser than A090934, where the least significant digit is swapped.
EXAMPLE
149 is a term as 149, 419 & 491 are all prime.
MATHEMATICA
fQ[n_] := Block[{a = c = IntegerDigits[n], b = {}, l = Floor[ Log[10, n] + 1]}, Do[ a = c; {a[[1]], a[[i]]} = {a[[i]], a [[1]]}; AppendTo[b, FromDigits[a]], {i, 1, l}]; Union[ PrimeQ[b]] == {True}]; Select[ Prime[ Range[ 270]], fQ[ # ] &] (* Ed Pegg Jr, Jan 15 2004 *)
CROSSREFS
Cf. A090934.
Sequence in context: A359139 A069706 A007500 * A107845 A234901 A090934
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Dec 29 2003
EXTENSIONS
Edited, corrected and extended by Robert G. Wilson v, Jan 15 2004
STATUS
approved

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Last modified September 20 11:54 EDT 2024. Contains 376068 sequences. (Running on oeis4.)