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A153432 Numbers m such that all ten numbers 10^k*m+1; k=0,1,...,9 are prime. 2
15538734736, 28034367522, 41221375552, 89468493268, 92220460962, 95951017078, 105627706800, 108012908976, 147689513538, 161055865908, 177073756566, 181921823202, 185137153012, 192336309046, 212463686778 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

If m & n are in the sequence, k<10 and r=m*n*10^k -1 is prime then r has

at least k+1 representations of the form p*q-(p+q)where p & q are prime.

LINKS

Table of n, a(n) for n=1..15.

Carlos Rivera, Two Bergot questions

CROSSREFS

Cf. A153431, A153433.

Sequence in context: A186094 A023050 A233704 * A349324 A022241 A186016

Adjacent sequences: A153429 A153430 A153431 * A153433 A153434 A153435

KEYWORD

nonn

AUTHOR

Farideh Firoozbakht, Mar 31 2009

STATUS

approved

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Last modified January 29 08:01 EST 2023. Contains 359915 sequences. (Running on oeis4.)