A112783 - OEIS

A112783

Beginning with 2, primes of the form: least multiple of the previous term followed by a 7. Beginning with 2, a(n) is the least prime of the form k*a(n-1)*10 +7.

2, 47, 947, 18947, 947357, 47367857, 4263107137, 682097141927, 545677713541607, 65481325624992847, 21608837456247639517, 4105679116687051508237, 944306196838021846894517

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OFFSET

1,1

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..300

MATHEMATICA

NestList[Block[{k = 1, m}, While[! PrimeQ[Set[m, 10 k # + 7]], k++]; m] &, 2, 12] (* Michael De Vlieger, Nov 14 2021 *)

CROSSREFS

Cf. A112782, A112784.

Sequence in context: A160922 A276509 A120050 * A277655 A246543 A119776

Adjacent sequences: A112780 A112781 A112782 * A112784 A112785 A112786

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Jan 02 2006

EXTENSIONS

More terms from Joshua Zucker, Jan 11 2006

STATUS

approved