Self-contained math crossword with if-then-else clues

^{An entry in Fortnightly Topic Challenge #43: Variety Crossword Grids}

Since I’m not good with with words and crosswords, here is a math crosswords: to know all the operands for the calculations you will have to replace the content of the brackets (e.g. {1 across}) with the answer to that clue (e.g. the answer to 1 across).

Some clues are of the form "if condition then A else B". As you can easily imagine in this case the answer is A if the condition is true and B otherwise.

ACROSS

1: 2 to the {26 down}
5: if {27 across} is prime then 243 else 148
7: if {11 down} is a multiple of 42 then 300 else 118
8: if {1 across} < {35 across} then 47 else 82
10: if {33 down} is prime then 1848 else 2949
13: {31 across} + {7 across} + 176
15: {13 across}/{5 down}
16: {10 across} x {28 across} + 16837
18: {8 across}th pentagonal number
20: product of the digits of {31 across}
21: {32 across} – {4 down}
22: 6th term of OEIS A{9 down}
23: 7 x {4 down} / 10
24: 1000 + {5 across}
26: 5 x {20 across}
27: {30 across} + {13 across} – 664
28: if {2 down} is a multiple of 3 then 1567 else 1887
30: if all the digits of {1 down} are even then 1779 else 1189
31: {4 down} – 4
32: 2 x {23 across}
34: {28 down} / 5
35: {32 across} * {27 across} + 252

DOWN

1: 3226 x {17 down}
2: 2 + {13 across}
3: 520 + {24 down} * {20 across}
4: 2 * {20 across}
5: {33 down} read backwards
6: 4 x {30 across}
9: 4 x {3 down} + 140
11: {30 across} – 307
12: if {32 across}<50 then 8532 else 4137
14: ({15 across} – 5)th fibonacci number
17: if {26 across} is a multiple of 30 then 205 else 285
19: if {9 down} is odd then 27243 else 97158
24: if {14 down} is prime then 2896 else 1010
25: if {13 across} is a multiple of 3 then 4881 else 4798
26: {34 across} – {5 down}
27: {20 across}th prime number
28: {7 across} / 2
29: 12 x {8 across}
33: {30 across} – {24 across}

SOME CLARIFICATIONS

• All the answers are natural numbers in base ten without leading zeroes.
• Fibonacci numbers start with zero: 0, 1, 1, 2, 3, 5….
• Here you can find the OEIS website.

_{source: original puzzle by me. For this reason can you please provide some feedback about the grid? Is it too easy?}