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A309566 a(n) is the least prime that can be written as a sequence of primes separated by n single zeros, and where every 0-splitting is prime. 1
307, 130307, 309370307, 30281172370306703 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

Carlos Rivera, Puzzle 970. A309566

EXAMPLE

a(1) = 307 = A309101(1).

130307 is a term since 3, 7, 13, 307, 1303, 130307 are all prime.

CROSSREFS

Subsequence of A309101.

Cf. A000040 (primes), A038618 (zeroless primes), A056709 (primes with zeros).

Sequence in context: A176091 A118284 A234030 * A118843 A224675 A249552

Adjacent sequences:  A309563 A309564 A309565 * A309567 A309568 A309569

KEYWORD

nonn,base,fini,full

AUTHOR

Michel Marcus, Aug 08 2019

EXTENSIONS

a(4) from Daniel Suteu and Giovanni Resta, Aug 09 2019

STATUS

approved

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Last modified October 22 10:20 EDT 2019. Contains 328317 sequences. (Running on oeis4.)