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A100028 Values of n for which the decimal number 10...030...01 is an n-digit prime. 7
3, 5, 7, 9, 23, 29, 33, 185, 267, 307, 757, 897, 1571, 2977, 3831, 4595, 6573, 9511, 11651, 15641, 68885, 69883 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..22.

FORMULA

a(n) = 2*(A171376(n+1))+1. - Chai Wah Wu, Aug 20 2015

EXAMPLE

The corresponding primes are 131, 10301, 1003001, 100030001, 10000000000300000000001, etc.

CROSSREFS

Cf. A100026, A100027, A100456, A100457, A100458, A100459.

Sequence in context: A273519 A241175 A099995 * A053681 A135773 A262029

Adjacent sequences:  A100025 A100026 A100027 * A100029 A100030 A100031

KEYWORD

nonn,base

AUTHOR

Harvey Dubner (harvey(AT)dubner.com), Nov 20 2004

STATUS

approved

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Last modified July 19 12:47 EDT 2018. Contains 312775 sequences. (Running on oeis4.)