7810 - ISO 7810 is the ISO's standard for credit and debit cards
7823 - Sophie Germain prime, safe prime, balanced prime
7825 - magic constant of n×n normal magic square and n-Queens Problem for n = 25.
7841 - Sophie Germain prime, balanced prime
7875 - triangular number
7883 - Sophie Germain prime
7897 - centered heptagonal number
7901 - Sophie Germain prime
7909 - Keith number
7912 - weird number
7920 - the order of the Mathieu group M11, the smallest sporadic simple group
7921 - 892, centered octagonal number
7944 - nonagonal number
7957 - super-Poulet number
7965 - decagonal number
7979 - highly cototient number
