A179445 Nonprimes m such that 10m + 1 are primes.

1, 4, 6, 10, 15, 18, 21, 24, 25, 27, 28, 33, 40, 42, 46, 49, 52, 54, 57, 60, 63, 64, 66, 69, 70, 75, 76, 81, 82, 88, 91, 94, 99, 102, 105, 106, 115, 117, 118, 120, 123, 129, 130, 132, 136, 138, 145, 147, 148, 153, 160, 162, 172, 174, 180, 183, 186, 187, 190, 195, 201

Offset

1,2

Comments

Corresponding values of 10m + 1 in A179446.

Links

Table of n, a(n) for n=1..61.

Mathematica

Select[Complement[Range[500], Prime[Range[PrimePi[500]]]], PrimeQ[10#+1]&] (* Harvey P. Dale, Jul 28 2010 *)

Crossrefs

Sequence in context: A333846 A076957 A310585 * A310586 A121214 A219047

Adjacent sequences: A179442 A179443 A179444 * A179446 A179447 A179448

Keyword

nonn

Author

Jaroslav Krizek, Jul 14 2010

Extensions

More terms from Harvey P. Dale, Jul 28 2010

Status

approved