employment
(2)The amount of the annuity provided under subsections (a) and (b) of this section to an individual who (A) will not have met the conditions set forth in subclause (i), (ii), or (iii) of clause (A) of subdivision (1) of this subsection, but (B) will have (i) completed ten years of service prior to, and (ii) been permanently insured under the Social Security Act [42 U.S.C. 301et seq.] as of December 31 of the calendar year prior to 1975 in which he last rendered service as an employee to an employer, or as an employee representative, shall be increased by an amount equal to the amount by which (C) the sum of (i) the primary insurance amount to which such individual would have been entitled, upon the attainment of age 65 (or, if later, for January 1975), under the provisions of the Social Security Act as in effect on, if his service as an employee after, and prior to, were included in the term “employment” as defined in that Act and if he had no wages or self-employment income under that Act other than wages derived from such service as an employee, and (ii) the primary insurance amount to which such individual would have been entitled, upon the attainment of age 65 (or, if later, for January 1975), under the provisions of the Social Security Act as in effect on, on the basis of his wages and self-employment income derived from employment and self-employment under that Act as of December 31 of the calendar year prior to 1975 in which he last performed service as an employee under this subchapter, exceeds (D) the primary insurance amount to which such individual would have been entitled, upon the attainment of age 65 (or, if later, for January 1975), under the provisions of the Social Security Act as in effect on, on the basis of his wages and self-employment income derived from employment and self-employment under that Act as of December 31 of the calendar year prior to 1975 in which he last performed service as an employee under this subchapter and on the basis of compensation derived from service as an employee after, and prior to, if such service as an employee had been included in the term “employment” as defined in that Act.