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Bibliography

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R. B. Crittenden and C. L. Vanden Eynden, A proof of a conjecture of Erdös, Bull. Amer. Math. Soc. 75 (1969), 1326-1329. MR 0249351 (40:2596)

[2]

P. Erdös, Remarks on number theory. IV: Extremal problems in number theory. I, Mat. Lapok. 13 (1962), 228-255. (Hungarian) MR 33 #4020. MR 0195822 (33:4020)

[3]

-, Problems and , Proc. Conf. Number Theory (Boulder, Colorado, 1963).

[4]

-, Extremal problems in number theory, Proc. Sympos. Pure Math., vol. 8, Amer. Math. Soc., Providence, R.I., 1965, p. 183. MR 30 #4740. MR 0174539 (30:4740)

[5]

John Selfridge, Research announcement, Amer. Math. Soc. Annual Meeting (New Orleans, 1969).

[6]

-, On congruences covering consecutive integers, Acta Arith. (to appear).

[7]

S. K. Stein, Unions of arithmetic sequences, Math. Ann. 134 (1958), 289-294. MR 20 #17. MR 0093493 (20:17)