First of quadruples of consecutive happy numbers.

Terms

a(0) =7839a(1) =8739a(2) =11248a(3) =12148a(4) =21148a(5) =44488a(6) =44489a(7) =44939a(8) =49439a(9) =70839a(10) =78039a(11) =80739a(12) =87039a(13) =94439a(14) =101248a(15) =102148a(16) =110248a(17) =112048a(18) =120148a(19) =121048a(20) =201148a(21) =210148a(22) =211048a(23) =222688a(24) =222689a(25) =226288a(26) =226289a(27) =236839a(28) =238639a(29) =258598