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%I #8 Jul 20 2021 23:44:39
%S 4,5303944,6677714,2070936216988528558,2969428172738875624,
%T 6685545813563350444,8013829604553736451395958429212,
%U 9724110515510343256451213152382
%N Numbers k such that k concatenated with k-2 gives the product of two numbers which differ by 1.
%e 6677714//6677712 = 8171728 * 8171729, where // denotes
%e concatenation.
%Y Cf. A116134, A054214, A116154, A116272.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006